Creating the delicious Pizza Cottage Cheese Bake is straightforward if you follow these easy steps:

1. Preheat the Oven: Preheat your oven to 350°F (175°C).
2. Prepare the Baking Dish: Lightly grease a 9×13-inch baking dish with cooking spray or olive oil.
3. Mix the Cheeses: In a large bowl, combine the cottage cheese, mozzarella, and Parmesan cheeses. Stir until well blended.
4. Add Marinara Sauce: Fold in the marinara sauce, ensuring the cheese mixture is evenly coated.
5. Incorporate the Vegetables: Add the chopped bell peppers, sliced mushrooms, and black olives to the cheese mixture. Mix until evenly distributed.
6. Season the Mixture: Sprinkle in the dried oregano, garlic powder, salt, and black pepper. Stir to combine.
7. Transfer to Baking Dish: Pour the mixture into the prepared baking dish, spreading it out evenly.
8. Top with Pepperoni: If using, arrange the sliced pepperoni on top of the mixture for added flavor.
9. Bake: Place the dish in the preheated oven and bake for 45-50 minutes, or until the top is golden and bubbly.
10. Cool Slightly: Once baked, remove the dish from the oven and let it cool for 10-15 minutes before serving.
11. Garnish: If desired, garnish with fresh basil leaves for an extra touch of flavor.

By following these steps, you will create a mouthwatering Pizza Cottage Cheese Bake that everyone will enjoy.