2 T vegetable oil
1 large onion, thinly sliced
1 t salt
4 oz. baby bella mushrooms, sliced
2 T butter
1 1/2 granny smith apples, cut into 1/2″ cubes
1 t sugar
1 1/2 oz. grated gruyere cheese
2 T chives, minced
1/2 t dried thyme
1 package frozen puff pastry, thawed
1 egg, beaten
Heat oil in a skillet add onions and salt, cook until golden brown, about 30 minutes. Remove and place in a large bowl, set aside. In the same skillet, saute mushrooms until tender, about 5 minutes. Remove and place in bowl with the onions.
In same skillet, melt the butter and add apples and sugar. Cook until softened, about 10 minutes. Place in the bowl with onions and mushrooms. Add the cheese, chives, and thyme to the bowl, mix well. Season with salt and pepper, to taste.
Cut puff pastry into 2-inch squares with a pizza cutter and place on parchment paper lined baking sheet. Brush beaten egg on the squares.
Place a tablespoon of filling in the middle of each puff pastry.
Bake at 400 degrees for 25 minutes, until pastry is golden brown and crisp.
