Cheesy Spinach and Mushroom Pinwheels

from ButterYum

Makes 24

1 egg

1 tablespoon water

1/2 cup roughly chopped white button mushrooms

1/2 cup shredded cheddar cheese

1/4 cup grated parmesan cheese

2 scallions, chopped

1/4 teaspoon granulated garlic powder

1/4 teaspoon granulated onion powder

1/4 teaspoon kosher salt

10 ounces frozen spinach, thawed and drained very well

1 sheet of frozen puff pastry, thawed (1/2 of a 17.3-ounce package)

about 2 tablespoons flour

Preheat oven to 400F. Make an egg wash by beating egg and water together; set aside. In the bowl of a food processor, grind together the mushrooms, both cheeses, scallions, seasonings, and well drained spinach; set aside. On a lightly floured surface, unfold the sheet of puff pastry. Brush the top with the egg wash and spread the spinach mixture in an even layer, leaving 1/2-inch border all around. Roll the pastry lengthwise, sealing the edge with a bit of egg wash. Using a serrated knife, cut the rolled pastry into 1/2-inch pieces and place cut side up on a silicone or parchment lined sheet pan. Brush pinwheels with remaining egg wash and bake for 20 minutes, or until golden brown. Cool on sheet pan for 5 minutes before transferring to a cooling rack. Serve warm or at room temperature.