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Home » Type » Appetizers » Caramelized Onion Tartlets

Caramelized Onion Tartlets

October 2, 2020 by Faith Leave a Comment

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If you love French Onion Soup, these cheesy Caramelized Onion Tartlets will be your new favorite appetizer! With caramelized onion, fresh thyme, and Gruyere cheese they have the same flavor profile as the soup, but with a buttery extra flaky crust.

Top View of Caramelized Onion Tartlets Recipe on Wooden Table

As we move into fall, most of us have heartier foods on our minds. Soups and stews, casseroles, pies, and cookies. Foods that bring families together, and foods that we can share with friends.

I love whipping up a batch of cookies or baking up a pie this time of year. There’s just something about the cool, crisp air and colorful leaves that puts me in the mood to spend an afternoon in the kitchen creating something beautiful and delicious.

And let’s not forget that baking season doesn’t have to mean a sweet treat. These bite-sized French Onion Soup-inspired Caramelized Onion Tartlets are easy to whip up when you want to bake!

Baked French Onion Tartlets in Mini Muffin Tray

These tartlets have a secret ingredient. A touch of Argo Corn Starch in the crust makes them extra crisp and flaky!

With a rich, buttery, crisp crust and a savory cheesy onion filling, these cheese and onion tartlets will be your favorite new appetizer or addition to brunch. Bookmark the recipe now for the holidays because they’ll be here before we know it.

French Onion Tartlets Recipe with Description

In This Article

  • Caramelized Onion Tartlets Recipe
  • How to Make Pie Crust From Scratch
  • How to Caramelize Onion
  • More Bite-Sized Appetizers to Try:
  • Caramelized Onion Tartlets

Caramelized Onion Tartlets Recipe

This recipe for French Onion Tartlets really only has three main steps: 1) make the dough for the crust, 2) caramelize the onion and mix together the couple ingredients for the filling, and 3) bake!

If you usually opt for premade pie crust, don’t be intimidated to make your own. I’m going to show you just how easy it really is.

Baked Onion and Cheese Tartlets with Argo Corn Starch

And caramelizing onion is as easy as cooking onion low-and-slow in a heavy skillet. The cooking process does all the work and magically melts the onion down, transforming it to something sweet and savory.

The filling for these cheese and onion tartlets is similar to a savory quiche, with a cream, egg, and cheese base in addition to the caramelized onion. A flavorless cornstarch slurry (basically a mixture of Argo Corn Starch and cold water) help it to thicken and set.

How to Make Pie Crust From Scratch

Ingredients for Pie Crust with Cornstarch

Get out the ingredients to make pie crust: all-purpose flour, Argo Corn Starch (this is the key to a crisp crust!), salt, butter, and ice water.

Cut Butter Into Flour to Make Pie Crust

Whisk together the flour, corn starch, and salt, and then use a fork or pastry cutter to cut in the diced butter.

Adding Ice Water to Dough to Make Pie Crust

Ball of Pie Crust Dough

Work in enough ice water so that it forms a dough and you can squeeze it into a ball.

Disk of Pie Crust Dough

Shape the dough into a disk, wrap it in plastic wrap, and refrigerate to chill, about 30 minutes to 1 hour. Or you can chill the dough for up to 3 days and let it sit at room temperature for about 15 minutes before rolling it out.

Rolling Out Pie Crust

Roll out the dough on a lightly floured surface to a circle about 14 inches in diameter.

Rolling out Pie Crust Dough

Use a 3-inch cookie cutter (or a glass with that diameter) to stamp out circles in the dough. Gather the scraps of dough, re-roll them, and continue stamping out circles until the dough is gone.

Stamping Circles Out of Pie Crust Dough

Press each dough circle into the well of a mini muffin tray.

Pressing Dough Circles Into Mini Muffin Tray

Now you’re ready to fill the tart shells to make these Caramelized Onion Tartlets!

Filling Caramelized Onion Tartlets

How to Caramelize Onion

Peel and thinly slice onion.

Cook the onion with a pat of butter in a heavy-bottomed skillet (I like to use cast-iron) over medium heat until the onion is melted down into a rich golden brown color. Stir frequently and turn the heat down or add a splash of water as necessary to prevent the onion from burning.

Caramelized Onion

You can slather caramelized onion on top of burgers, add them to grilled cheese, or use them to whip up an omelet!

And of course caramelized onion is one of the star ingredients in the filling of our French Onion Tartlets recipe.

Mixing Caramelized Onion Filling

More Bite-Sized Appetizers to Try:

  • Spanakopita Puff Pastry Bites
  • Turkey Sausage Meatballs with Sugar Free Cranberry Sauce
  • Date and Walnut Crispbread with 3 Brie Topping Ideas
  • Pigs in a Blanket
  • Zucchini Stacks with Goat Cheese

French Onion Tartlets in Mini Muffin Tray

Did you make this recipe? Please rate it and leave a comment below because I love hearing from you! You can also tag @anediblemosaic on social media. To stay up-to-date FOLLOW ME on Instagram, Twitter, and Facebook. Xoxo, Faith

Top View of Caramelized Onion Tartlets Recipe on Wooden Table

Caramelized Onion Tartlets

By: Faith Gorsky
With caramelized onion, fresh thyme, and Gruyere cheese these Caramelized Onion Tartlets have the same flavor profile as French Onion Soup, but with a buttery extra flaky crust.
Print Recipe Pin Recipe
Prep Time 1 hr
Cook Time 1 hr 15 mins
Course Appetizer, Snack
Cuisine American
Servings 12 servings
Calories 329 kcal

Ingredients
  

Crust:

  • 2 1/4 cups all-purpose flour plus more for rolling out the dough
  • 1/4 cup Argo Corn Starch
  • 3/4 teaspoon salt
  • 1 cup unsalted butter chilled and diced
  • 3/4 cup ice-cold water plus more as needed

Filling:

  • 2 tablespoons unsalted butter
  • 3 small-medium yellow onions peeled and thinly sliced
  • 1/2 teaspoon salt
  • 1/2 teaspoon black pepper
  • 1 clove garlic peeled and crushed
  • 1 teaspoon minced fresh thyme leaves
  • 2 large eggs
  • 1/4 cup heavy whipping cream
  • 4 teaspoons Argo Corn Starch dissolved in 1/4 cup cold water to make a slurry
  • 4 ounces Gruyere cheese shredded

Instructions
 

For the Crust:

  • Whisk together the flour, corn starch, and salt, and then use a fork or pastry cutter to cut in the diced butter.
  • Adding 2 tablespoons of ice-cold water at a time, work in enough water so that it forms a dough and you can squeeze it into a ball.
  • Shape the dough into a disk, wrap it in plastic wrap, and refrigerate to chill, about 30 minutes to 1 hour. Or you can chill the dough for up to 3 days and let it sit at room temperature for about 15 minutes before rolling it out.

For the Filling:

  • Add the butter to a large, heavy-bottomed skillet over medium heat.
  • Once melted, add the onion and cook until the onion is melted down into a rich golden brown color, about 35 to 45 minutes. Stir frequently and turn the heat down or add a splash of water as necessary to prevent the onion from burning.
  • Add the salt, black pepper, garlic, and thyme and cook 1 minute more, stirring constantly. Cool.
  • Whisk together the eggs, cream, and corn starch slurry in a large bowl, and then whisk in the cooled caramelized onion. Whisk in the cheese.

To Assemble and Bake the Tartlets:

  • Preheat the oven to 375F.
  • Roll out the disk of dough on a lightly floured surface to a circle about 14 inches in diameter.
  • Use a 3-inch cookie cutter (or a glass with that diameter) to stamp out circles in the dough. Gather the scraps of dough, re-roll them, and continue stamping out circles until the dough is gone.
  • Press each dough circle into the well of a mini muffin tray. Fill each tart with 1 tablespoon of caramelized onion filling.
  • Bake until the crust is golden and the filling is set, about 25 to 30 minutes.
  • Let the tartlets cool until you can handle them, and then pop each one out of the mini muffin tray.
  • Serve warm or at room temperature.

Faith's Tips

  • This recipe makes 48 tartlets for a total of 12 servings. Each serving is 4 tartlets.
  • Store these tartlets wrapped in the fridge for up to 5 days.
  • To reheat these tartlets, place them on a baking tray and heat in a 375F oven until warm, about 8 minutes.

Nutrition

Nutrition Facts
Caramelized Onion Tartlets
Amount Per Serving (4 tartlets)
Calories 329 Calories from Fat 207
% Daily Value*
Fat 23g35%
Saturated Fat 14g88%
Cholesterol 90mg30%
Sodium 291mg13%
Potassium 91mg3%
Carbohydrates 24g8%
Fiber 1g4%
Sugar 1g1%
Protein 7g14%
Vitamin A 741IU15%
Vitamin C 2mg2%
Calcium 117mg12%
Iron 1mg6%
* Percent Daily Values are based on a 2000 calorie diet.
Keyword Caramelized Onion Tartlets, Cheese and Onion Tartlets, French Onion Tartlets
Tried this recipe?Let me know how it was!

Caramelized Onion Tartlets Pin

Disclosure: This post contains Amazon affiliate links to products I believe in, which means that even though it doesn’t cost you anything extra, I will receive a small amount of money from the sale of these items. Thank you for helping to support An Edible Mosaic!

Filed Under: Appetizers, French, Savory Pies Tarts and Pastries Tagged: Caramelized Onion Tartlets, Caramelized Onions, Cheese and Onion Tartlets, French Onion Tartlets, Pie Crust with Cornstarch

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Hello and welcome to An Edible Mosaic! This is my recipe collection of international favorites and updated American classics with an emphasis on seasonal dishes. Here you’ll find a focus on real foods that sustain body and mind, bring people together, and make a house a home.

 

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I’m Faith Gorsky, the writer, cook, and photographer behind An Edible Mosaic. My goal is to inspire you to get in the kitchen and try something new! Feel free to email me with questions or comments.

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affiliate disclosure

An Edible Mosaic is monetized in part though affiliate links, and as an Amazon Associate I earn from qualifying purchases. This means that if you click on an affiliate link and/or purchase an item after clicking on an affiliate link, I may receive a percentage of the sales price. I only recommend products that I love and use. To learn more, please read my Privacy Policy.

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