Caramelized Onion Mushroom Tart (Printable)
Savory tart layered with caramelized onions, mushrooms, and creamy cheese on a flaky crust.
# What You'll Need:
→ Pastry
01 - 1 sheet ready-made puff pastry, thawed (approx. 8.8 oz)
→ Vegetables
02 - 2 large yellow onions, thinly sliced
03 - 10 oz cremini or button mushrooms, cleaned and sliced
04 - 2 cloves garlic, minced
→ Dairy & Eggs
05 - 3.5 oz crème fraîche or sour cream
06 - 3.5 oz Gruyère cheese, grated
07 - 1 large egg, lightly beaten
→ Fats & Oils
08 - 2 tablespoons unsalted butter
09 - 1 tablespoon olive oil
→ Seasonings
10 - 1 teaspoon fresh thyme leaves (or ½ teaspoon dried)
11 - ½ teaspoon salt, plus additional to taste
12 - ¼ teaspoon freshly ground black pepper
# How To Make It:
01 - Preheat oven to 400°F. Line a baking sheet with parchment paper.
02 - Melt butter and olive oil in a large skillet over medium heat. Add onions and a pinch of salt. Cook slowly, stirring frequently, for 18 to 20 minutes until onions are golden and caramelized.
03 - Add mushrooms and minced garlic to the skillet. Sauté for 8 to 10 minutes until mushrooms release moisture and begin to brown. Stir in thyme, black pepper, and adjust salt as needed. Remove from heat and let cool slightly.
04 - Roll out the thawed puff pastry on a lightly floured surface to fit the baking sheet. Transfer pastry to the lined sheet and score a ½-inch border around the edges without cutting through.
05 - Combine crème fraîche and beaten egg in a small bowl. Spread this mixture evenly within the scored border on the pastry.
06 - Evenly distribute the caramelized onion and mushroom mixture over the creamy base. Sprinkle the grated Gruyère cheese on top.
07 - Bake in the preheated oven for 20 to 22 minutes until the pastry is puffed and golden brown.
08 - Allow tart to cool slightly before slicing. Serve warm or at room temperature.
# Tips from dashanddishes:
01 -
- It's like uncovering a little secret that makes simple ingredients dance in perfect harmony
- The combination of sweet onions and earthy mushrooms with a crisp pastry has you coming back for more
02 -
- Caramelizing onions isn't quick; patience here unlocks the tart's soul
- Let the mushroom mixture cool before adding to pastry to prevent sogginess
03 -
- Use a heavy-bottomed skillet to ensure even caramelization without hot spots
- Don't rush stirring the onions; the slow cooking deepens flavor notes