Heat oven to 375°F. Brown ground beef in large nonstick skillet over medium heat 8 to 10 minutes or until beef is not pink, breaking up into small crumbles. Pour off drippings; season with salt. Stir in spaghetti sauce, tomatoes, and red pepper. Combine ricotta cheese, Parmesan cheese, and egg in medium bowl. Spread 2 cups beef sauce in bottom of 13 x 9-inch baking dish. Top with 4 noodles, arranged lengthwise in single layer; place fifth noodle crosswise at end of dish, breaking noodle to fit. Press noodles lightly into sauce. Spread all the ricotta mixture over noodles. Sprinkle with 1 cup mozzarella cheese; top with 1-1/2 cups beef sauce. Top with remaining noodles in single layer; press into sauce. Top with remaining beef sauce. Bake in 375°F oven 45 minutes or until noodles are tender. Sprinkle with remaining 1/2 cup mozzarella cheese. Let stand 15 minutes. Makes 12 servings.