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Cheesy Caramelized Onion Tart Recipe

onion tart slice on dish
onion tart slice on dish - Michelle Bottalico/Tasting Table

Caramelizing onions is the perfect way to take an ordinary, humble ingredient and, with a bit of patience, transform it into an irresistible mixture of rich, buttery, salty, and sweet goodness that melts in your mouth. Put those onions on a tart, and you really don't need anything else to make it a showstopper.

Recipe developer Michelle Bottalico has created a recipe for a cheesy caramelized onion tart that takes those delicious onions, which can hold up the tart on their own, and pairs them with Swiss cheese, Parmesan, and chives for a subtle flavor boost. Allow enough time to prepare the onions, because they cook slowly, but the end result is definitely worth it. Plus, a frozen puff pastry sheet makes this recipe come together more effortlessly. The result is a crispy, flaky crust topped with melted cheeses and those rich and creamy onions that is sure to become a favorite at your next get-together.

Read more: The 20 Best Olive Oils For Cooking

Gather Your Cheesy Caramelized Onion Tart Ingredients

onion tart ingredients on table
onion tart ingredients on table - Michelle Bottalico/Tasting Table

To make this recipe, you will first need to caramelize some onions, and you will need butter, olive oil, Vidalia onions, salt, and pepper for that step. Pick up a puff pastry sheet from the freezer aisle, and make sure to thaw it before starting to make the tart. You'll also need Swiss cheese and Parmesan cheese to add more flavor to this dish, as well as fresh chives to sprinkle on top before baking.

Step 1: Heat Butter And Oil

butter melting in hot pan
butter melting in hot pan - Michelle Bottalico/Tasting Table

Place butter and olive oil in a large pan with deep sides over medium heat.

Step 2: Add The Onions

sliced onions cooking in pan
sliced onions cooking in pan - Michelle Bottalico/Tasting Table

Once butter is melted and bubbly, add onions and cook, stirring occasionally, for 7-8 minutes until translucent. Add salt and pepper, and stir.

Step 3: Keep Cooking The Onions

caramelized onions cooking in pan
caramelized onions cooking in pan - Michelle Bottalico/Tasting Table

Lower heat to medium-low and cook for an additional 30 minutes, stirring occasionally to prevent sticking, until onions are soft and browned. If all the liquid evaporates, add water 1 tablespoon at a time to prevent the onions from burning. Lower the heat a little if necessary.

Step 4: Adjust For Seasoning

caramelized onions cooking in pan
caramelized onions cooking in pan - Michelle Bottalico/Tasting Table

Taste and adjust for salt if necessary.

Step 5: Preheat The Oven

oven preheating
oven preheating - Michelle Bottalico/Tasting Table

Preheat oven to 400 F.

Step 6: Unroll The Pastry Sheet

puff pastry sheet on pan
puff pastry sheet on pan - Michelle Bottalico/Tasting Table

Unroll puff pastry sheet and place onto a parchment-lined baking sheet.

Step 7: Fold In The Sides

puff pastry sheet on pan
puff pastry sheet on pan - Michelle Bottalico/Tasting Table

Fold in all 4 sides about ½ inch and press gently to form finished edges. Prick the bottom all over with a fork.

Step 8: Distribute The Cheese

cheese covered puff pastry on baking sheet
cheese covered puff pastry on baking sheet - Michelle Bottalico/Tasting Table

Evenly distribute the Swiss cheese on the pastry sheet, followed by the Parmesan cheese.

Step 9: Add The Onions

onion tart ready to bake
onion tart ready to bake - Michelle Bottalico/Tasting Table

Arrange the onions in an even layer on top of the cheese.

Step 10: Sprinkle On The Chives

onion tart ready to bake
onion tart ready to bake - Michelle Bottalico/Tasting Table

Sprinkle the chives on top of the onions.

Step 11: Bake The Tart

caramelized onion tart on baking tray
caramelized onion tart on baking tray - Michelle Bottalico/Tasting Table

Place the baking sheet in the oven and bake for 20-23 minutes until the pastry crust is lightly browned and cooked on the inside and the cheese is melted and hot.

Step 12: Serve The Cheesy Caramelized Onion Tart

sliced caramelized onion tart on plates
sliced caramelized onion tart on plates - Michelle Bottalico/Tasting Table

Let cool for about 5 minutes before slicing and serving. The tart can also be served at room temperature if desired.

Can I Substitute Any Ingredients In This Caramelized Onion Tart Recipe?

2 Vidalia onions on table
2 Vidalia onions on table - Michelle Bottalico/Tasting Table

This recipe contains a pleasing combination of ingredients, but the truth is, there's not only one way to make this delicious onion tart. It's highly customizable depending on your tastes and what you have on hand. Vidalia onions are a good choice for caramelized onions because of their sweet and mild flavor, but you can use other kinds of sweet onions with good results, or even regular yellow or red onions. Some people like to add a couple teaspoons of sugar along with the salt for a sweeter taste, but that is up to you. Onions can be caramelized in butter, olive oil, or both, so feel free to switch it up if you prefer one or the other. Just keep the overall quantity the same.

You can't go wrong with many different kinds of cheeses in this recipe. If you don't have Swiss, you could try Gruyére, Gouda, or feta. For a stronger taste, you could even use blue cheese or Gorgonzola if you like a pungent flavor.

A little water is added to the pan if the onions start to stick in order to keep them from burning. If you want to go for a stronger taste reminiscent of French onion soup, you could use beef broth instead. Lastly, many kinds of fresh herbs would work well here, so if you don't have chives, you can use a different kind depending on what's available.

Can I Make This Cheesy Caramelized Onion Tart Ahead Of Time?

onions caramelizing in pan
onions caramelizing in pan - Michelle Bottalico/Tasting Table

Yes, you can make this caramelized onion tart ahead of time to fit your schedule better. You have two options depending on what works best for you. The first is to make the whole tart ahead of time. You can serve it at room temperature if the waiting time wasn't that long, or you can store it in the fridge for up to 4 days. Bring the tart back to room temperature before eating it, or reheat it in the oven right before serving.

The second option is to only caramelize the onions ahead of time and then assemble and bake the tart before serving. The onions are the most time-consuming part of the preparation, so this is a good option if you're pressed for time the day you plan to enjoy it but still want to serve a freshly baked dish. Caramelized onions will keep in an airtight container in the refrigerator for up to 7 days, or in the freezer for 6 months.

Cheesy Caramelized Onion Tart Recipe

onion tart slice on dish
onion tart slice on dish - Michelle Bottalico/Tasting Table

Prep Time: 15mCook Time: 1hYield: 6 servingsIngredients

  • 1 tablespoon butter

  • 1 tablespoon olive oil

  • 2 large Vidalia onions, thinly sliced

  • ½ teaspoon salt

  • ¼ teaspoon ground black pepper

  • 1 sheet thawed puff pastry

  • 1 cup shredded Swiss cheese

  • 2 tablespoons grated Parmesan cheese

  • 1 tablespoon finely chopped fresh chives

Directions

  1. Place butter and olive oil in a large pan with deep sides over medium heat.

  2. Once butter is melted and bubbly, add onions and cook, stirring occasionally, for 7-8 minutes until translucent. Add salt and pepper and stir.

  3. Lower heat to medium-low and cook for an additional 30 minutes, stirring occasionally to prevent sticking, until onions are soft and browned. If all the liquid evaporates, add water 1 tablespoon at a time to prevent the onions from burning. Lower the heat a little if necessary.

  4. Taste and adjust for salt if necessary.

  5. Preheat oven to 400 F.

  6. Unroll puff pastry sheet and place onto a parchment-lined baking sheet.

  7. Fold in all 4 sides about ½ inch and press gently to form finished edges. Prick the bottom all over with a fork.

  8. Evenly distribute the Swiss cheese on the pastry sheet, followed by the Parmesan cheese.

  9. Arrange the onions in an even layer on top of the cheese.

  10. Sprinkle the chives on top of the onions.

  11. Place the baking sheet in the oven and bake for 20-23 minutes until the pastry crust is lightly browned and cooked on the inside and the cheese is melted and hot.

  12. Let cool for about 5 minutes before slicing and serving. The tart can also be served at room temperature if desired.

Read the original article on Tasting Table.