In a bowl, combine softened cream cheese, Parmesan cheese, mayonnaise, garlic powder, onion powder, pepper, and thoroughly dried spinach. Mix until smooth and creamy.

Lightly flour your countertop, then unroll your puff pastry sheet. Spread the filling evenly across the pastry, leaving one long edge bare.

Starting from the filled side, carefully roll the pastry tightly toward the bare edge, sealing as you go. Wrap in plastic wrap and refrigerate for at least 30 minutes.

Preheat your oven to 400°F.

Once chilled, slice the log into half-inch rounds. Arrange pinwheels on a parchment-lined baking sheet and brush with egg wash.

Bake for 15-20 minutes until puffed and golden brown. Let cool slightly before serving.