Caramelized Onion, Mushroom, Apple & Gruyère Bites - Elegant Appetizer - Recipes by Clare

Ingredients

• 2 tbsp vegetable oil, for caramelizing onions.
• 1 large onion, thinly sliced, for a sweet and savory base.
• 4 oz baby bella mushrooms, sliced, for earthiness.
• 2 tbsp unsalted butter, for cooking apples.
• 1 ½ Granny Smith apples, cubed, for a tart and sweet contrast.
• 1 tsp granulated sugar, to enhance apple sweetness.
• 1 ½ oz grated Gruyère cheese, for creamy richness.
• 2 tbsp minced chives, for freshness.
• ½ tsp dried thyme, for a hint of herbaceousness.
• 1 lb puff pastry, thawed, for the flaky base.
• 1 egg, beaten, for brushing the pastry.