Preheat oven to 425F.

Unroll pizza crust onto parchment paper.

Spread pizza sauce, leaving about 2 inches dough dry around the perimeter.

Keeping the perimeter dry from all ingredients, sprinkle with Parmesan cheese then lay out the mozzarella slices.

Top with thin slices of cooked warm meatballs (if you use frozen ones, make sure they are warmed up).

Brush egg around the edges of dough.

Keeping the stromboli long, fold over end edges onto the topping and brush again with egg.

Starting on one side, roll up like a burrito, pressing seams closed.

Place seam underneath.

Brush the top with egg and sprinkle with the shredded Parmesan.

Bake for thirty minutes or until nicely browned and about 195F inside.

Cool for a few minutes before slicing.

Serve with extra pizza sauce as a dip if you like.