Cook Ziti According To Package Directions. Meanwhile, In A Skillet, Cook The Beef, Onion And Green Pepper Over Medium Heat Until Meat Is No Longer Pink; Drain. Stir In The Tomato Sauce, Italian Seasoning, Garlic Powder And Pepper. Cook And Stir Until Heated Through, About 3 Minutes. Drain Pasta. Spread Half Of The Meat Sauce In A 1-Qt. Baking Dish Coated With Nonstick Cooking Spray. Top With Half Of The Ziti, Ricotta Cheese And Mozzarella Cheese. Repeat Layers. Bake, Uncovered, At 350 Degrees F For 20-25 Minutes Or Until Heated Through. Let Stand For 5 Minutes Before Serving.