Preheat oven to 350 degrees. Coat a 9 x 9 inch baking pan or Pyrex dish with cooking spray. Set aside.
Cook spaghetti noodles and drain.
In the meantime, in a large bowl, add onions, zucchini, mushrooms and red bell pepper. Cook in microwave 3-4 minutes until soft. Drain any liquid. Stir in pasta sauce, Italian seasonings and black pepper.
In another bowl, combine cottage and cheese wedge pieces. Mix well.
To assemble casserole: Spread a small amount of sauce (about ¼ cup) on the bottom of pan. Spread half of spaghetti noodles on top of sauce. Cover with cheese mixture and spread evenly over pasta. Cover with ¾ cup pasta sauce. Add remaining noodles. Finally spread remaining sauce. Sprinkle with Parmesan cheese evenly over top.
Bake uncovered for about 30 minutes until hot and browned.
Let sit for about 15 minutes to set. This casserole can be made a day or two in advance. It also freezes great!
Cut into 6 slices (each serving, 1 slice).