Caramelized Onion, Mushroom, Apple & Gruyere Bites Recipe - (4.2/5)

Ingredients

• 2 tablespoons vegetable oil
• 1 large onion, thinly sliced
• 4 ounces baby bella mushrooms, sliced
• 2 tablespoons unsalted butter
• 1 1/2 granny smith apples, cubed into 1/2" cubes
• 1 teaspoon granulated sugar
• 1 1/2 ounces Gruyere cheese, grated
• 2 tablespoons chives, minced
• 1/2 teaspoon dried thyme
• 1 pound package frozen puff pastry, thawed
• 1 egg, beaten