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Whisk together the egg and water, and set aside.
Mix together the cheeses, onion, and seasonings. Set aside.
Roll out the puff pastry on a lightly floured surface to flatten the seams. Brush the surface with your egg wash.
Top the surface with the cheese mixture, then break apart the spinach and spread evenly over the surface.
Starting on the short side that's covered with filling, roll up the pastry like a jellyroll.
Line two baking sheets with parchment. Slice the roll into ½-¾ inch slices and place them on the prepared sheets.
Pop them into the refrigerator or freezer to let them cool as the oven preheats to 400 degrees.
Bake for 15 minutes or until they're golden.