Press pizza crust dough into bottom and up sides of a9-inch round cakepan coated with cooking spray. Coat dough with cooking spray (to help crust brown). Bake at 425° on bottom rack of oven for 10 minutes.
Drain spinach, and press between paper towels to remove excess moisture. Combine spinach and next 3 ingredients; stir well. Add breadcrumbs, Parmesan cheese, and egg white, stirring well. Shape mixture into 12 meatballs. Coat a large nonstick skillet with cooking spray; place over medium-high heat until hot. Add meatballs, and cook 8 to 10 minutes or until browned. Drain and pat dry with paper towels.
Spread 1/2 cup Classic Italian Tomato Sauce over crust, leaving a 1/2-inch border. Combine cottage cheese, ricotta cheese, 1/4 cup provolone cheese, and pepper rings. Spread half of cheese mixture over tomato sauce. Arrange meatballs over cheese mixture. Spoon remaining 1/2 cup tomato sauce and remaining cheese mixture around meatballs. Bake at 425° on bottom rack of oven for 15 minutes. Sprinkle with remaining 1/4 cup provolone cheese, and bake 5 additional minutes or until cheese melts. Let stand 10 minutes before serving.