Pizza-Stuffed Pasta Shells

Heat oven to 375 °F. Spray 13x9-inch (3-quart) glass or ceramic baking dish with cooking spray. In 10- or 12-inch nonstick skillet, cook 1 lb lean ground beef and 1 finely chopped garlic clove over medium-high heat 5 to 7 minutes, stirring occasionally, until thoroughly cooked. Drain. Stir in half of the 4 oz quartered pepperoni slices and 1 cup of the pizza sauce. Cook 5 minutes or until mixture is thoroughly heated. Remove from heat. Meanwhile, cook 21 uncooked jumbo pasta shells as directed on package. Drain. Stuff each cooked shell with 2 tablespoons beef mixture; place in single layer in baking dish. Cover shells with remaining 2 cups pizza sauce, the 2 cups shredded mozzarella cheese and the remaining half of the pepperoni. Bake 25 minutes or until bubbly and cheese is melted. Let stand 5 minutes before serving.