Spray 9×13 baking dish with nonstick spray and preheat oven to 350. Brown 1 lb lean ground beef, drain well. Add 1 cup frozen spinach, chopped thawed and drained and 1/4 cup chopped red bell pepper. Mix the meat with spinach and pepper and pour mixture in baking dish. Sprinkle 2 oz shredded cheddar cheese over mixture. In separate bowl, beat 5 large eggs, salt and pepper. Pour eggs over mixture. Bake at 350 for 20 minutes. Remove from oven, letting it sit for 5 minutes before serving. Cut in to squares to serve.