Preheat your oven to 425°F. Toss cauliflower florets, red bell pepper squares, and onion wedges with 1 tablespoon olive oil plus half the salt. Spread these out on a baking sheet and roast for 20 to 25 minutes till tender and caramelized.
While the veggies roast, bring salted water to boil and cook the pasta till al dente according to the package. Drain and set that aside.
In a big bowl, mix 2 cups of the marinara sauce with the roasted veggies, cooked pasta, chopped basil, and half the mozzarella cheese.
Spread half of the remaining marinara sauce on the bottom of a baking dish. Layer your ziti mixture over that. Dollop the cottage or ricotta cheese on next evenly across the top.
Spread the rest of the marinara sauce over the cheese layer then sprinkle the rest of the mozzarella cheese on top.
Cover the dish tightly with foil and pop it in the oven. Bake for 20 minutes, then take off the foil and bake an extra 10 minutes till the cheese gets bubbly and golden.
Take the baked ziti out and let it rest for a few minutes before serving. Sprinkle extra fresh basil on top for a pretty finish.