Caramelized Onion Mushroom Cheese (Recipe for Printing)

Enjoy a warm, flaky puff pastry braid filled with caramelized onions, sautéed mushrooms, and melted cheese—ideal for spring gatherings. Save & click.

# What You Need:

→ Filling

01 - 2 tablespoons olive oil
02 - 1 tablespoon unsalted butter
03 - 2 large yellow onions, thinly sliced
04 - 8 ounces mushrooms, sliced (cremini or button)
05 - 2 cloves garlic, minced
06 - 1 tablespoon balsamic vinegar
07 - Salt, to taste
08 - Black pepper, to taste
09 - 1 teaspoon fresh thyme leaves, plus more for garnish

→ Assembly

10 - 1 sheet frozen puff pastry, thawed
11 - 1 cup shredded Gruyère cheese or mozzarella cheese
12 - 1 large egg, beaten
13 - 1 tablespoon sesame seeds (optional)

# How to Make It:

01 - Warm olive oil and butter in a large skillet over medium-low heat. Add sliced onions and cook slowly for 25 to 30 minutes, stirring occasionally, until onions become deep golden brown and very soft.
02 - Stir in balsamic vinegar, thyme, salt, and pepper. Cook for an additional 2 minutes, then remove from skillet and set aside to cool.
03 - In the same skillet, add a drizzle of olive oil if needed and cook sliced mushrooms over medium-high heat for about 5 to 7 minutes until golden and all moisture evaporates.
04 - Add minced garlic to the mushrooms and sauté for 30 seconds. Remove from heat and mix mushrooms with caramelized onions. Let the filling cool slightly.
05 - Preheat oven to 400°F. Roll out the thawed puff pastry on a sheet of parchment paper.
06 - Position the pastry so the long side faces you. Spoon onion-mushroom mixture down the center third of the pastry, leaving sides clear. Scatter shredded cheese evenly over the filling.
07 - Cut 1-inch wide diagonal strips along both sides of the pastry. Alternately fold strips over the filling from each side to create a braid pattern.
08 - Brush the top of the pastry with beaten egg. Sprinkle with sesame seeds if desired.
09 - Transfer with parchment to a baking sheet. Bake for 25 to 30 minutes, or until pastry is golden brown and puffed.
10 - Allow to cool for 5 minutes. Garnish with fresh thyme leaves. Slice and serve warm.

# Extra Tips:

01 - For best results, ensure onions are deeply caramelized and pastry remains chilled prior to assembly. Using Gruyère adds a nutty complexity.

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