Prep time: 10 minutes | Total time: 18 minutes

Preheat oven to 400°F. Line baking sheet with parchment paper.

On lightly floured work surface, unroll 1 sheet puff pastry. Lay prosciutto over top; sprinkle with Gruyère. Top with remaining puff pastry sheet; roll lightly with a rolling pin to flatten slightly. Cut pastry into twelve 1/2-inch strips. Twist each end of the strips in opposite directions; cut in half to make 24 pieces.

Transfer to prepared baking sheet. Whisk egg with 1 tbsp water; brush over strips. Bake in center of oven for 8 to 10 minutes or until golden.

Heat marinara sauce; serve with cheesy twists.