Heat oven to 350°F. In small bowl, mix ricotta and Parmesan cheeses. Spoon 2 tablespoons pizza sauce onto each tortilla; spread evenly to within 1/4 inch of edge.
Top half of each tortilla with 1/4 of ricotta mixture and 1/4 of mozzarella cheese. Fold tortillas over filling, pressing edges to seal; place on ungreased cookie sheet.
Bake 8 to 10 minutes or until cheese is melted.