PREPARATION:
- Preheat oven to 400°F. Spray baking dish with cooking spray. Coat bottom of 2-quart baking dish with 1 cup marinara sauce.
- Place one chicken breast between 2 sheets of plastic wrap on a cutting board. Roll and pound with rolling pin until meat is about 1/4-inch thick. Repeat with remaining chicken breasts.
- Press 1/2 cup spinach leaves on each chicken breast. Place 1 slice mozzarella cheese on each and roll up tightly, pressing firmly. Place rolls seam sides down in baking dish. Cover with remaining marinara sauce.
- Cover dish with foil and bake 35 minutes. Uncover and bake 10 minutes more. Garnish each serving with 1 tablespoon grated Parmesan cheese and red pepper flakes to taste.
