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Caramelized Onion and Balsamic Tomato Tarts…with everything bagel spice and plenty of fresh thyme. These fun tarts are the perfect summertime appetizer or light dinner. Flaky puff pastry dough topped with caramelized onions, two kinds of cheese, fresh thyme, basil, and balsamic cherry tomatoes. Once baked, the pastry dough turns golden brown and the tomatoes burst, turning sweet and delicious. You just can’t beat these easy tarts!

overhead photo of Caramelized Onion and Balsamic Tomato Tarts |

I know it’s Thursday and all, but my gosh I wish it was Friday. Normally the days of the week really do not matter to me at all. In general, I pretty much enjoy every day of the week. Because (for the most part), I truly love what I do. I love creating new recipes, I love styling food, and I love photographing each recipe for you all to see. And of course, my favorite part is interacting with you all through comments, emails, and Instagram. It’s the greatest job, and even just writing these sentences out has me feeling so much better. Sometimes you just have to remember the good, so you can push all the negative out. Easier said than done.

If you didn’t already guess, Tuesday was a stressful day. But today I am thankful that I have this incredibly delicious, and oh easy recipe to share. It’s a good one that I have been dying to share for weeks now.

Typically, I get ideas for new seasonal recipes weeks and weeks before the season actually starts. So by the time I’m ready to share the recipe with you all, I’m usually overly excited. I mean, I’ve been keeping the recipe all to myself, I’m dying to share it!

The good news is that summer is so close. Which means tomatoes have started to arrive. Which means it’s tomato tart season!

YESS!

overhead photo of Caramelized Onion and Balsamic Tomato Tarts on baking sheet before baking

What I love about tart recipes is that they are truly the easiest. I usually use my favorite store-bought puff pastry and then just layer on my toppings. Puff pastry is one of those store-bought items that I find so much easier to just pick up at the store versus making it at home. I know some might argue this, but I live by store-bought puff pastry. It’s one of my favorite ingredients to use to whip up quick and delicious recipes.

Bottom line here? Keep your freezer stocked with puff pastry. OK? Great. Moving on.

overhead close up photo of Caramelized Onion and Balsamic Tomato Tarts

To start, you’ll need to caramelize some onions, which is really simple. Just cook up some onions along with the tiniest amount of honey until the onions turn deep golden in color. The honey helps to caramelize the onion faster, giving them a rich color and flavor. While caramelizing the onions is an additional step, it’s so worth it. The caramelized onions make this tart.

While the onions are cooking away, start preparing the pastry. All you need to do is roll the pastry out and cut it into 4 squares. Very easy.

Now, toss those sweet and juicy cherry tomatoes with some balsamic vinegar, and fresh basil.

Layer the onions over the pastry squares, add a mix of cheddar and Havarti cheese, and then pile on the tomatoes. You may worry that there are too many tomatoes for the amount of dough, but don’t stress. The tomatoes burst and break down in the oven. They are so delicious!

Finish each pastry square off with a sprinkle of everything bagel spice. My favorite seasoning blend to mix with summer tomatoes. And then bake!

side angled photo of Caramelized Onion and Balsamic Tomato Tart

As this bakes, the tomatoes slowly roast, the cheese melts, and the pastries become flaky. SO GOOD.

And…your kitchen will indeed smell amazing! Like the flavors of summer…again, just SO GOOD.

Make these tarts as an easy dinner to pair with a simple side salad, or serve them up as an appetizer for your next gathering. Either way, these are going to be loved by all. My hope is that they’ll become a staple in your kitchen for the next few months.

overhead close up photo of single Caramelized Onion and Balsamic Tomato Tart cut in half

If you make these Caramelized Onion and Balsamic Tomato Tarts, be sure to leave a comment and/or give this recipe a rating! Above all, I love to hear from you guys and always do my best to respond to each and every comment. And of course, if you do make this recipe, don’t forget to tag me on Instagram! Looking through the photos of recipes you all have made is my favorite!

Caramelized Onion and Balsamic Tomato Tarts

Prep Time 15 minutes
Cook Time 30 minutes
Total Time 45 minutes
Servings: 4 8 as an appetizer
Calories Per Serving: 958 kcal

Nutritional information is only an estimate. The accuracy of the nutritional information for any recipe on this site is not guaranteed.

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Ingredients

Instructions

  • 1. Preheat the oven to 425 degrees F. Line a baking sheet with parchment paper.
    2. Heat 1 tablespoon olive oil in a large skillet over medium-high heat. When the oil shimmers, add the onions and honey and cook 5 minutes, stirring occasionally until softened. Season with salt and pepper and continue cooking another 5-10 minutes or until the onions are golden and caramelized. Add the garlic, and thyme, cook another minute. Remove from the heat.
    3. In a bowl, combine the remaining 1 tablespoon olive oil, the tomatoes, balsamic vinegar, basil, crushed red pepper, and a pinch each of salt and pepper.
    4. Lay the pastry sheet flat on a clean, floured surface. Gently roll the sheets out to stretch slightly. Cut each sheet into 4 squares and place onto the prepared baking sheet. Evenly top each square with onions, leaving a 1/4 inch border. Top with both kinds of cheese and then mound the tomatoes over the cheese, pressing them into the cheese to adhere slightly (see above photo). 
    5. Fold the edges of the pastry inward to enclose the tomatoes. Brush the edges of the pastry with beaten egg and sprinkle with everything spice. Transfer to the oven and bake for 20-25 minutes or until the pastry is golden and the tomatoes burst. Top with fresh thyme and chives.

Notes

Calories based on being served as a main
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Comments

  1. I’m so excited to make these, they look absolutely delicious! I’m looking for a gluten-free crust alternative… Would you suggest a gluten-free pie mix? Or is there something better? Thanks!

    1. Hi Catherine,
      You should be able to find GF puff pastry at your local grocery store. Let me know if you have any other questions! xx

    1. Hi Shelley,
      Wonderful! I am thrilled to hear this recipe was enjoyed, thanks for giving it a go! Happy New Year!🎆 xTieghan

      1. I’m going to try these tomorrow, I thought I’d make them ahead of time and then keep them in the fridge until I need to bake them….do you think aok? Book Club Night!

        1. Hey Michelle,
          You bet, that would be totally fine to do! I hope this recipe is enjoyed, have a great book club night! xTieghan

  2. Made this as an appetizer and everyone loved it! Me especially! I made extra of the caramelized onions to put on sandwiches and burgers! They are delicious! This will be a regular for me! Love your recipes!

  3. This looks delicious! If I don’t have a puff pastry on-hand, is there one of your recipes to use for the base? Thank you.

  4. 5 stars
    This is the first recipe I’ve tried from you, and what can I say, I love it! I needed something easy and somewhat quick that let me use all those yummy garden cherry tomatoes and basil. Chock full of summer flavor. Thank you 😊

    1. Hey Mara,
      Happy Friday!! I am thrilled to hear that this recipe was enjoyed, thanks a lot for giving it a try! xTieghan

  5. Hi! I was thinking about serving these at family gathering, but I was wondering if they’re safe to sit out all day since there is some cheese in the recipe. Would it drastically alter the tart if cheese was omitted?

    1. Hey Annie,
      I would keep the cheese, but these would be fine to leave out for a few hours. I hope you love this recipe, please let me know if you give it a try! xTieghan

    1. Hey Debbie,
      Fantastic! I am thrilled that this recipe was enjoyed, thanks for giving it a go! xTieghan

  6. 5 stars
    Simply amazing – been meaning to rate as I’ve already made these 5 times. My family keeps asking for them and now they are requested for holidays! A true winner, thank you!!!

    1. Hey Katie,
      Happy Monday! I am so glad this recipe was enjoyed, thanks a bunch for making it! xTieghan

  7. 5 stars
    These tarts were the hit of our family birthday brunch! I made the onions the night before, and the tomato mixture in a separate bag. Let everything come to room temp &assembled/baked the day of. So, so wonderful! TY! They were gone too fast to photograph!

  8. Another delicious recipe of yours was added to our dinner rotation last night — thank you Tieghan!
    I addded shredded chicken to make it a main dish and everyone loved it.

  9. 5 stars
    Mine didn’t come out nearly as beautiful as Tieghan’s (nothing ever does!) but boy, did these taste delicious! I didn’t have havarti so I only used cheddar, and I didn’t feel like it was lacking anything. The onion mixture with the fresh thyme and honey is so delicious, I will definitely use it in other recipes.

    Tieghan, do you think you’d be able to prepare these ahead of time and bake whenever you’d like them? Or does that get complicated with the puff pastry? Thanks!

    1. Hey Blayre,
      Thanks so much for giving the recipe a try, I am so glad it was enjoyed! You can make ahead of time:) Happy New Year! xTieghan