This rich and flavorful French Onion Tart recipe can be served as an appetizer, side dish or an entree. It features an incredible depth of flavor from cooking the onions until they’re fully caramelized. The french onion filling is spread into a homemade pastry and topped with Gruyere cheese to wrap it all up.

Easy French Onion Tart Recipe

This homemade onion tart is an impressive dish to make. I really love these sorts of savory pies and find myself turning to them for a special brunch, lunch or supper with friends. The trick to the depth of flavor is being patient and cooking the onions until they reach that perfect point of being deeply caramelized and sweet. How to make a simple savory French Onion Tart with a homemade pie crust:

Crust – All purpose flour, salt, salted butter and cold water.
French Onion Filling – Salted butter, garlic and 4 large yellow onions.
Seasonings – Salt, sugar, black pepper and
Herbs – Fresh thyme leaves plus additional for garnishing
Balsamic vinegar.
Cheese – Shredded gruyere or white cheddar cheese and chive and onion cream cheese.
Dijon mustard.
Egg wash – Large egg.
Garnish – Grated or shredded Parmesan cheese.

How to Make the Best French Onion Tart Recipe

Ingredients you’ll need to make homemade French Onion Tart: Yellow onions, butter, salt, granulated sugar, minced garlic, balsamic vinegar, fresh thyme, shredded Gruyere cheese, chive and onion cream cheese, Dijon mustard, one large egg beaten for the egg wash and grated or shredded Parmesan cheese.
To make the Pastry Crust you’ll need: All purpose flour, butter, salt and cold water.
Kitchen gadgets you’ll need: Mixing bowls, a pastry blender, measuring cups and spoons, sharp knife and cutting board, a large pot or skillet to cook the onions, a cheese grater and a sheet pan to bake the tart.
This tart is somewhat like a savory galette popularly made with sweet pie and fruit fillings. It’s a free form pie and doesn’t require a special pan to bake it.
When cooking the onions patience is key. Depending on how vigorously they cook it will change the amount of cooking time. Adjust according to the depth of color and flavor and once it’s achieved, they’re ready!
Parchment paper will keep the tart from sticking to the pan and over browning.
The french onions mixture for the filling can be prepared one day in advance and placed into an airtight container and chilled until assembling the tart to bake.
When making the pastry, it’s important to allow it rest time to chill and firm the butter in the crust. Doing so will allow the butter to melt slowly while baking and create steam for a flaky texture and pleasing end result.
You could use shredded or grated Parmesan cheese for sprinkling on the crust.
I prefer the nutty flavor of Gruyere cheese for this recipe. That being said, you could adapt the flavor using a sharp white cheddar cheese or Asiago cheese. You could also use a cheese blend that you enjoy.
Store leftover French Onion Tart wrapped in aluminum foil chilled in the refrigerator for up to 3 days.
Reheat pieces in single servings in the microwave or on a sheet pan in a 350°F oven for a few minutes just until heated through. If it begins to brown lay a piece of aluminum foil on top.

More Savory Pies and Tart Recipes to Make

Plum Tomato Tart is another option that has several severing options. Enjoy it as a lighter entree, side dish or appetizer.
Bacon and Onion Bistro Tart was inspired by my favorite corner bistro from College.
Fresh Tomato Tart with Basil Pesto and Fontina Cheese is packed with fresh summer flavors.
Double Crust Chicken Pot Pie is comfort food 101.
This recipe for Broccoli Cheese Quiche with Bacon forms its own crust while baking.
Treat the family to a Chicken Pot Pie Crescent Ring for supper any day of the week.
Beef and Potato Galette from A Foodie Affair.

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