Caramelized Onion, Mushroom & Gruyere Tartlets

Continuing down the road of appetizers, dips and snack food leading up to the Super Bowl, I give you this somewhat “upscale” game day food. Caramelized onions, mushrooms and Gruyere cheese are baked atop circles of puff pastry for a flaky, savory and delicious appetizer. Another occasion that this appetizer would be great for? A baby shower! Fellow food blogger Annie from Annie’s Eats is expecting her second baby in April (a girl!) and a group of bloggers organized a virtual baby shower to celebrate Annie’s bundle of joy, and of course we all brought food to the party! Since appetizers are my second love behind desserts and this is Super Bowl week, I definitely wanted to go that route, and thought that these little tartlets would be something Annie and other ladies at a shower would certainly enjoy. To see all of the great drinks, appetizers, main dishes and desserts that other bloggers contributed to the virtual shower, head on over to Annie’s and Courtney’s blogs for the roundup. For more on the tartlets, keep reading!

One of the great things about these tartlets is that you can cut the circles smaller or larger depending on how many you want to serve or how truly bite-size you want them to be. I did 3-inch circles, but you can definitely adjust depending on your needs.

These are equal parts sophisticated and easy – the best type of entertaining food in my book. You could even prepare the caramelized onions and mushrooms ahead of time and then assemble and bake right before guests arrive. Perfect for a football game or a baby shower! :)

One year ago: English Muffins

Caramelized Onion, Mushroom & Gruyere Tartlets

Yield: 16 3-inch tartlets

Prep Time: 1 hour

Cook Time: 20 minutes

Total Time: 1 hour 20 minutes


1 tablespoon olive oil
1 large yellow onion, thinly sliced
1 tablespoon unsalted butter
16 ounces white button mushrooms, thinly sliced
1 clove garlic, chopped
½ teaspoon dried thyme
Salt and pepper, to taste
¼ cup white wine (can substitute chicken or vegetable broth)
2 sheets puff pastry (thawed according to directions on package)
1 cup shredded Gruyere cheese (can substitute any variety of Swiss cheese)
1 egg + 1 tablespoon water, beaten together (for the egg wash)
Handful of parsley, chopped


1. Preheat oven to 400 degrees F and line two baking sheets with parchment paper.

2. Heat the olive oil in a wide, heavy-bottomed pan over medium-low heat and add the onions. Cook, stirring occasionally, until they begin to caramelize, about 20 minutes.

3. Add the butter to the pan. Once melted, add the mushrooms and saute, stirring occasionally, until they are completely soft and all of the liquid evaporates, about 20 minutes.

4. Add the garlic and the thyme and saute until fragrant, about 1 minute. Season with salt and pepper to taste.

5. Add the wine, scraping the bottom of the pan to pull up all of the browned bits, and cook until all of the liquid has evaporated. Remove from heat.

6. Unfold the thawed sheets of puff pastry and cut out circles from the dough, placing them evenly spaced on the baking sheets. Using a very sharp knife, make four small scores around the perimeter of the dough, about ¼ to ½-inch from the edge.

7. Top the rounds of puff pastry with a small spoonful of the onion and mushroom mixture, trying to keep the filling within the score marks. Top with the shredded Gruyere cheese. Brush the edges of the dough rounds with the egg wash.

8. Bake until the pastry is golden brown, about 15 to 25 minutes. Garnish with fresh chopped parsley.

(Recipe adapted from Closet Cooking)

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108 Responses to “Caramelized Onion, Mushroom & Gruyere Tartlets”

Comment Pages 1 2
  1. Jessica on February 2, 2011 at 4:16 am

    Oh yum! These look perfect for my Superbowl line up! But I’m sure they would also go great at a baby shower 😉


  2. Rosa on February 2, 2011 at 7:06 am

    Those tartlets look mervelous and soooo appetizing! A great combination.




  3. amanda @ fake ginger on February 2, 2011 at 7:17 am

    Those look delicious! They seem so elegant but also something that would keep men happy!


  4. Julie @SavvyEats on February 2, 2011 at 7:54 am

    Caramelized onions and gruyere are two of my FAVORITE ingredients. Bookmarking these!


  5. Blog is the New Black on February 2, 2011 at 7:55 am

    These look wonderful! Perfect app. I am starring this one!


  6. Michelle on February 2, 2011 at 8:21 am

    Stunning photos! SU’d!!


  7. Feast on the Cheap on February 2, 2011 at 8:37 am

    These seem like they’re tailor-made for my mushroom & gruyete-loving husband. I’m printing this and may make them for V-Day!


  8. Lauren at KeepItSweet on February 2, 2011 at 8:39 am

    All of the food at her virtual shower looked amazing and I’d definitely like to eat these in real life!


  9. Courtney on February 2, 2011 at 8:47 am

    These are pretty much all of my favorite things packed into one recipe. They look so elegant and delicious, and I’ll definitely be trying them soon. Thanks again for participating in the virtual shower! :)


  10. jen @ the baked life on February 2, 2011 at 9:32 am

    yum! These are the type of appetizers you make for the wives of the men watching football! The boys can just have chips.


  11. Shanon on February 2, 2011 at 9:53 am

    I love anything with onions and cheese. These are beautiful. I want to reach right in and pick one up from my computer screen. And I love the fact that it’s a vegetarian option for an appetizer. I am adding these to my growing list of amazing must-do’s from this virtual shower!

    Shanon :)


  12. Maria on February 2, 2011 at 10:14 am

    YUM! That is all I have to say:)


  13. elly on February 2, 2011 at 10:16 am

    I have these saved from Kevin’s blog, too. Pretty much all my ingredients on top of buttery puff pastry. Um, yes please!


  14. Arlene on February 2, 2011 at 10:28 am

    Fabulous! Can’t wait to try these.


  15. lauren on February 2, 2011 at 10:41 am

    Oh, these look SO good. While reading Courtney’s post, I kept wishing this shower were a non-virtual occasion. :)


  16. ashley on February 2, 2011 at 10:46 am

    perfect choice for a shower. they really look fantastic!


  17. Lana @ Never Enough Thyme on February 2, 2011 at 10:56 am

    Love these perfect little bites! That combination of mushrooms, caramelized onion and Gruyere is just about my favorite. I’d pass right by the desserts to get to this little appetizer. Great job!


  18. Nikki (Pennies on a Platter) on February 2, 2011 at 11:03 am

    Wow, Michelle! I’m bookmarking these, possibly for the Superbowl. But, I’m thinking I want to just make them when I can eat all of them instead and not have to share! :)


  19. Georgia @ The Comfort of Cooking on February 2, 2011 at 11:07 am

    What an elegant and easy appetizer! Those are just beautiful. I might save them for the Valentine’s Day party I’m having with my husband and friends. Thanks!


  20. Mateja on February 2, 2011 at 11:54 am

    You have an award waiting for you:
    Mateja @Indulging Life


  21. Jenny Flake on February 2, 2011 at 12:17 pm

    These look so yummy!!


  22. Fuji Mama on February 2, 2011 at 12:17 pm

    These look SO good! I’m compelled to put these on my weekly menu for next week. MUST HAVE THEM FOR MYSELF! Seriously, if I have another baby, I think I need to fly you out so you can make food for my baby shower… :)


  23. Amy (Sing For Your Supper) on February 2, 2011 at 12:26 pm

    Mmm, these look so flaky and beautiful, Michelle! A perfect shower appetizer! This shower has been SO much fun and I’m so happy to have been a part of it! :)


  24. Amanda on February 2, 2011 at 12:39 pm

    These look absolutely gorgeous. What a perfect appetizer!


  25. Lori @ RecipeGirl on February 2, 2011 at 1:22 pm

    Whoa, these look amazing! Big problem is that I can eat too many of these!!


  26. Simple Skillet on February 2, 2011 at 1:49 pm

    These look absolutely delicious. Love all the ingredients….


  27. Carol Le on February 2, 2011 at 2:13 pm

    I am unsure what you mean by “four small scores around the diameter of the dough.” Can you elaborate and/or post a picture of this step? Thanks!!


    • Michelle on February 2nd, 2011 at 2:21 pm

      Hi Carol, Unfortunately I don’t have a photo of it, but I basically make four small semi-circle slits on each side of the dough round. You don’t want to cut the whole way through. I found this post with a photo of scored puff pastry, hopefully that helps!


      • Melissa on February 4th, 2011 at 12:56 pm

        Thanks for asking & answering this question! I needed to know as well!

        PS – I’m making these tonight!!


  28. Bhalo Khabo on February 2, 2011 at 2:19 pm

    Look delicious.. I wish I was eating them now…


  29. Tracy on February 2, 2011 at 2:45 pm

    Oh goodness, these are PERFECT for the Super Bowl this weekend. Yum!!


  30. Cat on February 2, 2011 at 2:46 pm

    Michelle, when you say “Using a very sharp knife, make four small scores around the diameter of the dough, about ¼ to ½-inch from the edge” I’m not clear on what you mean. Did you mean “diameter” or “perimeter”? The word “around” is what’s giving me difficulty. The diameter is a straight line right down the middle, so “around” doesn’t seem to fit. If you mean make scores around the perimeter, 1/4 to 1/2″ from the edge, that makes more sense to me. Of course, this could just be me…


    • Michelle on February 2nd, 2011 at 2:49 pm

      I meant perimeter, I changed it above. Good proof as to why I would have never been a good math major 😉


      • Cat on February 2nd, 2011 at 2:50 pm

        Thanks, Michelle, for the clarification.


  31. on February 2, 2011 at 3:19 pm

    A perfect blend of ingredients. And anything in puff pastry is good as far as I’m concerned!


  32. Jen @ My Kitchen Addiction on February 2, 2011 at 3:25 pm

    These look tasty! I just gruyere on just about anything!


  33. Lisa @ the Cooking Bride on February 2, 2011 at 3:55 pm

    I saw these on Annie’s Eats and thought they looked absolutely SCRUMPTIOUS!


  34. Cookin' Canuck on February 2, 2011 at 4:04 pm

    These are absolutely adorable, Michelle! The combination of caramelized onions, mushrooms & gruyere is making me salivate.


  35. The Food Hound on February 2, 2011 at 4:28 pm

    I read about your virtual shower on Cook Like a Champion, and I think it’s awesome! These tarts look to die for!


  36. Felice on February 2, 2011 at 4:30 pm

    Little bites of yumminess! These sound wonderful.


  37. Aku on February 2, 2011 at 4:56 pm

    Yes please! These look so good. I can’t wait to give these a go, despite no Super Bowl, or baby shower, excuse!


  38. J3nn (Jenn's Menu and Lifestyle Blog) on February 2, 2011 at 5:33 pm

    Saw these on Annie’s blog, they look AMAZING! Love the flavor combo. YUM!


  39. Bonnie Deahl on February 2, 2011 at 6:22 pm

    I know these are fabulous! I have a very similar recipe that is truly a favorite. Your version looks fun. Will put these on my too do shopping list. Gotta love puff pastry..and mushrooms…and onions and wine!


  40. Caroline on February 2, 2011 at 6:38 pm

    Not much else I can say but “YUM” these look so good!!


  41. Alayna on February 2, 2011 at 6:54 pm

    These look great. Can’t wait to try them.


  42. Katrina on February 2, 2011 at 7:27 pm

    Amazing looking tarts!


  43. Pretty. Good. Food. on February 2, 2011 at 8:59 pm

    So simple! Can’t wait to give it a try :)


  44. Drick on February 2, 2011 at 9:01 pm

    this is my kind of snack, I think I could eat a plateful


  45. Maralyn D Hill on February 2, 2011 at 9:03 pm

    These are very nice. Quite similar to some I had last week in Lyon at Sirha while attending Bocuse d’Or. Your recipe is nice a simple.


  46. Sharlene on February 2, 2011 at 9:27 pm

    So beautiful and I imagine quite tasty too!


  47. Vegolicious on February 2, 2011 at 10:00 pm

    Your mini tartlets look absolutely delicious. I’d love for your to submit them to Vegolicious, a vegetarian food photo gallery where readers can browse beautiful photos to discover new recipes and wonderful blogs. If you would like to share this recipe with our readers please submit a photo along with a link to this post.


  48. Haley @ The Girly Girl Cooks on February 2, 2011 at 11:51 pm

    These look wonderful! I want to try these!


  49. Sues on February 2, 2011 at 11:56 pm

    These are SO adorable! And perfect for a classy Super Bowl :) Or just an evening when I’m in the mood for some tartlets :) Hehe.


  50. Jason Phelps on February 3, 2011 at 8:01 am

    Great combination of flavors. The pictures really make them look like I could grab one right now!



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