Preheat the oven to 375°F (190°C).

Cook the ziti pasta according to package instructions until al dente.

In a mixing bowl, combine cottage cheese, mozzarella cheese, parmesan cheese, spinach, mushrooms, bell pepper, garlic powder, onion powder, Italian seasoning, salt, and black pepper.

Drain the cooked pasta and mix it with the cheese and vegetable mixture.

Spread half of the marinara sauce on the bottom of a baking dish.

Layer the pasta mixture on top of the sauce, then top with the remaining marinara sauce.

Sprinkle additional mozzarella cheese on top if desired.

Cover the baking dish with foil and bake for 20 minutes.

Remove the foil and bake for an additional 10 minutes until the cheese is bubbly and golden.

Let it cool for a few minutes before serving.