Cheesy Spinach and Mushroom Pinwheels

Preheat oven to 400ºF. 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.