In a bowl combine sausage and bread crumbs. Form into small balls, and place on a baking sheet. Bake for 6-10 minutes, until cooked through.
Spread pizza crust onto baking sheet. Bake for 4 minutes.
Mix together spaghetti with 1 cup of Ragú sauce.
Remove crust from oven. Evenly spread with 1/2 cup Ragú sauce. Sprinkle with cheese. Spread the spaghetti evenly over the cheese. Sprinkle with Parmesan cheese.