Savory Puff Pastry Tart – Caramelized Onion & Cheese Bliss
A golden tart filled with deeply caramelized onions, fresh herbs, and Gruyère cheese—perfect for Christmas, Thanksgiving, or cozy winter meals.
- Prep Time: 20 minutes
- Cook Time: 1 hour
- Total Time: 1 hour 20 minutes
- Yield: 8 servings 1x
Ingredients
-
4–5 large yellow or sweet onions, thinly sliced
-
2 tbsp unsalted butter
-
1 tbsp olive oil
-
1 tsp fresh thyme leaves (or ½ tsp dried)
-
Salt and pepper to taste
-
1–2 tsp balsamic vinegar (optional)
-
1 pie dough or sheet of puff pastry
-
3 large eggs
-
¾ cup heavy cream or half-and-half
-
1 ¼ cups shredded Gruyère cheese
-
Optional garnish: fresh chives or extra thyme
Instructions
-
Preheat oven to 375°F. Roll and press crust into a tart pan. Chill and blind bake for 15–20 minutes. Let cool.
-
In a skillet, cook onions with butter and oil over low heat for 35–45 minutes until deeply caramelized. Season with salt, pepper, thyme, and optional balsamic. Let cool.
-
Whisk eggs, cream, salt, pepper, and half the cheese in a bowl.
-
Spread onions in the crust. Pour custard over and top with remaining cheese.
-
Bake 30–35 minutes until set and golden. Let cool before slicing.
Notes
Make ahead and reheat for holiday meals. Customize with roasted vegetables, goat cheese, or herbs.