Do you remember our easy Apple Tart? Well, think the same idea, but savoury. Introducing my mushroom tart recipe – call it “Tarte Fine aux Champignons” in French if you feel fancy! Flaky puff pastry topped with melted Gruyère, sautéed mushrooms and baked until crispy and golden. Let’s go!
Nagi's Notes
I feel like French food has a reputation for being time consuming and complicated. But for homestyle dishes, it usually isn’t. More often than not, it’s about a couple of hero ingredients making a dish shine – and this Mushroom Tart is exactly that. Just 4 ingredients – puff pastry, mushroom, cheese and butter, Simple and ridiculously good!
A Simple French Mushroom Tart
This is something I used to whip up back home when we needed a quick lunch or dinner that made everyone happy. Crispy and flaky butter puff pastry layered with melting cheese and sautéed mushrooms, all baked to perfection – Tarte Fine aux Champignons as we call it. What could go wrong!?
To enjoy it at its best, finish it with a sprinkle of salt flakes and fresh thyme leaves. A drizzle of truffle oil will bring it to another level if you have some. You’ll be surprised by the work-to-reward ratio here. A true winner!
Ingredients
Here is what you need to make this Tarte Fine aux Champignons. Please do your best to get a puff pastry made with butter rather than oil. Butter beats oil everyday when it comes to flavour. Take it from a Frenchman!
Frozen puff pastry – As I say above, butter is better! Butter puff rises more beautifully and gives you more delicate flaky layers and importantly, it has better flavour. Look for a packet that clearly says, “butter puff pastry.” If it doesn’t mention butter, it usually means it’s made with oil instead, which is still ok to use but won’t have the same flavour.
Size – This recipe calls for a 25cm / 10″ square of puff pastry which is the standard size here in Australia. If your sheet is larger, simply trim it to size. If you only have smaller pieces, press the offcuts together to form one larger sheet.
Swiss brown mushrooms – Also called cremini mushrooms in some countries. They have more flavour than white cup / button mushrooms, though they will work fine too. You could also use larger mushrooms like portobello, just slice them up into smaller pieces.
Gruyère cheese – My logical pick for this recipe because I used it so much in France. Gruyère is a staple cheese in France like cheddar and tasty cheese here in Australia. It’s a firm Swiss-style cheese with a nutty flavour that melts beautifully and has a rich flavour that doesn’t overpower the mushrooms.
Other cheese options – Comté would elevate it even more if it’s reasonably priced where you are but it is expensive here in Australia which is why I don’t use it. Swiss cheese / Emmental would be my next choice. Otherwise, use any good melting cheese you enjoy such as mild Cheddar, Monterey Jack, Colby or Tasty.
Unsalted butter – Adds flavour to the mushrooms and is also brushed on the pastry edges to help them turn golden.
Cooking salt / kosher salt – Used to season the mushrooms. If you’ve only got table salt, halve the amount. For salt flakes, increase by 50%. (We also use some salt flakes at the end as a lovely touch to finish the dish.)
Black pepper – Cracked black pepper, the one we usually use.
Thyme leaves – Thyme and mushrooms are a classic pairing. I like it best sprinkled at the end rather than cooked in the mushrooms because you get a better flavour for this dish.
Truffle oil or extra virgin olive oil – If you happen to have truffle oil, this a great opportunity to use it because it goes so well with mushrooms and adds a really gourmet touch to it. A small drizzle is enough to deliver a big impact and elevate the dish. I know it’s a bit pricey so I wouldn’t go and get it especially. You can always use a good extra virgin olive oil instead.
How To Make Mushroom and Gruyère Tart
This tart comes together in three simple steps: cook the mushrooms, assemble the tart, then bake until the pastry is crisp and golden. There is an actual fourth step “Eat it!” but I didn’t bother writing it down because the moment you see it come out of the oven, you’ll understand.
Preheat the oven and tray – Place a baking tray in the oven and preheat to 210°C / 410°F (190°C fan). Starting the tart on a hot tray helps the pastry cook immediately and become crisp underneath.
Cook the mushrooms – Heat the olive oil and butter in a frying pan over medium-high heat. Add the mushrooms, salt and pepper. Cook for about 5 minutes, stirring regularly, until the mushrooms soften.
Transfer to a colander over a bowl to drain. When testing this recipe, my mushrooms didn’t release much liquid. Draining them is mostly a safety step, just in case they do because this would soften the puff pastry.
Edges – Place a sheet of baking / parchment paper on the bench and lay the puff pastry on top. Fold the edges inward to create a 1 cm / 0.4″ border around the pastry. No need to use egg or anything to hold in place.
Brush the pastry edges with melted butter.
Cheese – Spread the grated Gruyère evenly over the pastry. Mostly avoiding the rim.
Mushrooms – Top with the cooked mushrooms, spreading them evenly too.
Bake – Lift the baking paper and tart onto the hot tray. Bake for 30 minutes, until the pastry is golden, puffed and crisp, including underneath.
Finish – Sprinkle the tart with fresh thyme leaves and salt flakes. Drizzle with truffle oil or extra virgin olive oil.
Serve – Cut into 4 or 6 pieces or more if you want smaller. Enjoy while hot!
How To Serve Mushroom and Gruyère Tart
Serve the tart warm, straight from the oven. For a lovely French meal, add a French Bistro Salad or my Baby Gem Salad that we shared last week. It also pairs well with other fresh salads like our Favourite Tomato Salad, the Garden Salad, a Mega Italian Salad or more classic like a Rocket with Balsamic Dressing.
It would also work great cut it into small squares and passed around as an appetiser or canapés.
That’s it for this one! If you make it, please let me know how it goes. I always enjoy reading your feedback or seeing your versions. Bon appétit! – JB
FAQ – Mushroom and Gruyère Tart
Yes. Assemble the tart and keep it in the fridge on a tray. Make sure the mushrooms are fully cooled before assembling and keep the pastry cold so it puffs properly. Bake straight from the fridge on a preheated hot tray. I haven’t tried to assemble, freeze and cook. But please let me know if you do!
See ingredients list above. ☝️😊
Yes, if they have a similar shape and structure to Swiss brown mushrooms. White cup / button mushrooms or portobello work well because they slice neatly and sit flat on the pastry.
Avoid other mushrooms with irregular shapes. They don’t layer evenly, so you won’t get a consistent topping, and they don’t give the same texture once baked on a flat tart like this.
Yes. Reheat at 180°C / 350°F (160°C fan-forced) for about 10 minutes until the pastry crips again.
Watch How to Make It
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JB’s Mushroom Tart
Ingredients
- 1 square sheet butter puff pastry (25cm / 10″ square), barely thawed (Note 1)
- 1 tbsp extra virgin olive oil
- 2 tbsp (30g) unsalted butter
- 400g / 14oz Swiss brown mushrooms , sliced 0.5cm (Note 3)
- 1/2 tsp cooking salt / kosher salt , use half for table salt
- 1/4 tsp black pepper
- 1 1/2 cups (tightly packed) Gruyère cheese , grated (Note 2)
- 2 tsp (10g) unsalted butter , melted (for brushing)
Toppings
- 1 1/2 tsp fresh thyme leaves
- 1 pinch sea salt flakes
- truffle oil or good extra virgin olive oil , to drizzle (optional) (Note 4)
Instructions
ABBREVIATED RECIPE
- Sauté mushrooms 5 minutes. Place puff pastry on baking paper, fold a 1 cm / 0.4" border, brush edges with butter, top with Gruyère and mushrooms. Bake on the preheated tray for 30 minutes. Finish with fresh thyme, salt flakes and truffle oil.
FULL RECIPE
- Hot tray – Place a baking tray in the oven. Turn the oven on and preheat to 210°C / 410°F (190°C fan).
- Cook the mushrooms – Heat the olive oil and butter in a frying pan over medium-high heat. Add mushrooms, salt and pepper. Cook for 5 minutes, stirring regularly, until soft. Transfer mushrooms to a colander over a bowl to drain in case of excess liquid.
- Prepare the base – Place a sheet of baking paper / parchment paper on the bench. Put the puff pastry on top. Fold the edges inwards to create a 1 cm / 0.4″ border and brush them with melted butter.
- Assemble – Spread the grated Gruyère evenly over the pastry. Top with the mushrooms, spreading them evenly too.
- Bake – Lift the baking paper and tart onto the hot tray in the oven. Bake for 30 minutes, until the pastry is golden and crisp (sides and underneath).
- Finish and serve – Sprinkle with fresh thyme leaves and salt flakes. Drizzle with truffle oil or a good virgin olive oil (optional but highly recommended). Cut and serve hot.
Recipe Notes:
Nutrition Information:
Remembering Dozer
This photo takes me back to the early days at the old HQ, helping Nagi shooting recipes for the first cookbook “Dinner”. The studio downstairs was being renovated so we had to make do with what we had, I am sure you’ll appreciate the garbage bags taped on the window! And Dozer, of course, right where he believed he should be. Sitting between my legs, convinced he wasn’t taking up any space at all. Always there, watching, making sure things were done properly, or at least in a way that involved snacks! But we all know he was a meat lover and this time I don’t think he realised we were shooting our stuffed butternut pumpkin! 😅
I couldn’t get gruyere that was less than about AU$12 for a small block so used about 25gm of finely grated fresh parmesan instead (thanks ChatGPT!). It still came out delicious but for me the cooking time/temp was too aggressive, mine was on the verge of being burnt. My oven is not over-powered or anything so maybe I should have put it in a lower shelf. Will definitely do it again when I need a treat though I’ll check it’s progress in the oven much more carefully!.
Hi Mike, sorry to hear that you had an issue during the cooking process. Please keep me updated next time you make it 🙂
Make this quick and easy recipe for lunch today. Didn’t have truffle not have truffle oil or buttery puff pastry, so used regular puff pastry. Turned out delicious and will definitely make this again
Thanks Eleni for leaving such a great comment ♥️
Wowza!! My guests loved it! It was easy and fun to put together but looks fancy!
I wouldn’t change a thing!!
Thanks Keran! It means a lot, glad you loved it 🙂
JB’s French Mushroom Tart
Making this tonight and noticed there is no link to the video … love the videos so hopefully the outcome will resemble the picture😀
Hi Sandie, the video is in the post. Let me know if you are still having trouble to see it.
Oh my! So delicious! So easy! Absolutely loved it and will make again
That’s what I want to hear! Thanks Sharon!
Thank you J.B absolutely delicious I couldn’t find truffle oil but Cobram sell truffle infused extra virgin olive oil 250ml bottles.which worked
Perfect Robyn! Thank you 🙂
I served this tonight for dinner as my partner had bought Swiss brown mushrooms at the market. I served it with a rocket, pear, Parmesan and walnut salad and I received very good reviews. Thank you.
Great news! Make sure you get all the credits! Thanks Haydon 🙂
I made this for dinner tonight and it was magnificent! I even made my own butter puff pastry for the first time, great tip putting it on a hot tray, the base was super crispy. Thanks JB 😊
Thanks Faye, yes it doesn’t look like much but starting with a hot tray makes a huge difference!
I forgot to add the 5 stars and thank JB. Merci beaucoup JB.
De rien!! Merci!
I made this last week and it was brilliant. I made 2 and on one I put a light spread of mild English mustard and that was very tasty. I’m making it again this week. My guests were very impressed, as was I. Thanks Nagi.
Thank you Debbie! I’m glad your guests loved it!
I added a pinch of nutmeg to the mushrooms. The recipe was perfect. My family loved it.
Thank you Marjolein! 🙂
Made this recipe tonight & it was fabulous. We combined it with a simple tomato & cucumber salad.
I didn’t have high hopes but I was trying to do a simple vegetarian meal.
The result was fantastic!
This recipe gets laminated & added to the “to do again” folder.
It made it to the special folder! Yeah! Thanks Stephen 🙂
OMG!!…Ended up making my puff pastry from scratch using Sally’s recipe because I didn’t want to spend 14 dollars for an all butter puff pastry….it was absolutely amazing!!… Surprised myself… delicious in every way!!
Thank Pamela for you lovely comment ♥️
Dear JB & Nagi, Wow!!! I can’t even find the words to express how absolutely wonderful this dish is. I was skeptical when it can to the truffle oil. I had tried it before, but really didn’t like it. So, I decided to do research on it, found the best rated ones with real truffles and was totally amazed how wonderful it was. Then I found the best puff pasty made with real butter. I had always used a brand that was made with oil, and didn’t know the difference. This dish is to die for! It is amazing just having the perfect ingredients changes a dish from ok to off the charts good! Thank you for both recommendations and this dish. Can you come up with some more dishes that uses a drizzle of truffle oil? I even think I want to try some crispy French fries dipped in truffle oil with some fresh herbs. It has to be better than Smash Fries! Again, thank you, THANK YOU! I appreciate all you do!
Hi Raelene, thank you for appreciating this dish, we love it so much too! Truffle oil does bring it to another level right!
Delicious yet simple preparation👍
Dozer💖
Thank you Nind!
I’m totally going to make this, even though I know it’s got more than 3g carbs especially if I eat 2 squares haha. I may sprinkle some psyllium husk on the pastry before adding the mushrooms and cheese just for insurance.
I’m totally going to make this, even though I know it’s got more than 3g carbs haha. I may sprinkle some psyllium husk on the pastry before adding the mushrooms and cheese just for insurance.
Hi Karen, thank you for leaving a comment 🙂 (Had to Google what psyllium husk was!)
J.B what a wonderful Tarte Fine aux Champignons! Made it with gruyère and a delicious rocket balsamic. It was easy and we have enough for a wonderful lunch tomorrow! Merci!
You are welcome Corinne! Thank you for leaving a feedback 🙂
This sounds divine — there is a restaurant here in Washington DC, Le Diplomate — they serve a mushroom tart and I order it every single time THIS LOOKS JUST LIKE IT!!! I cannot wait to try this , literally your recipes have NEVER failed me. Not once.
Thank you so much!!
I made this tonight for dinner and it’s already been requested again as soon as possible! Easy and delicious. I used Jarlsberg cheese because that’s what I had (and Gruyère is the same price as a gold bar 🙄). It was still delicious. It will be on rotation in this house -thank you JB and RTE ☺️
Thank you for your lovely feedback Irene, it means a lot! 🙂