Press spaghetti mixture onto bottom and up sides of pie plate, forming a crust. Use the back of a spoon to press it down. Spread Ricotta cheese on the bottom and up the sides of pasta crust. Spread meat mixture over the cheese. Sprinkle with mozzarella cheese.
Bake for 20-25 minutes or until bubbly and heated through. Cut into wedges. Makes 6 servings.