Recipe #305: Caramelized Onion, Mushroom, Apple, & Gruyere Bites

Another winner from foodgawker.com.  I knew I had to try these as soon as I saw the picture.  It didn't make enough filling for all of the pastry, though. I would probably add more onion and mushrooms to balance out the apple more, but it was still delicious this way.

Ingredients:

2 tbsp. vegetable oil
1 large onion, thinly sliced
4 oz. baby bella mushrooms, sliced
2 tbsp. unsalted butter
1½ granny smith apples, cubed into ½" cubes
1 tsp. granulated sugar
1½ oz. grated gruyere cheese
2 tbsp. chives, minced
½ tsp. dried thyme
1 package (1 pound) of frozen puff pastry, thawed
1 egg, beaten

Instructions:

1. Preheat oven to 400 degrees. Line baking sheets with silicone baking mats. Set side.
2. In a large skillet, heat the vegetable oil and cook the onions (with 1 tsp. of salt) until they're
golden brown, about 30 minutes. Remove and set aside in a large bowl. In the same skillet,
sauté mushrooms until tender, about 5 minutes. Remove and set aside in the bowl with the
onions.
3. In the same skillet, melt the butter and add in the apples with the sugar. Cook until softened,
about 10 minutes. Remove from pan and add to the large bowl with onions and mushrooms.
4. Add the cheese, chives, and thyme to the bowl and stir to combine the mixture well. Season
with salt and pepper, to taste.
5. With a pizza cutter, cut the puff pastry into 2­inch squares and place them on the lined
baking sheets. Using a pastry brush, brush beaten egg on the squares.
6. Using a tablespoon, place filling in the middle of each puff pastry.
7. Bake for 25 minutes, rotating the pans halfway through and switching the baking sheet on
the top rack to the bottom and the bottom to the top, until the pastry is golden brown and
crisp.