To prepare vegetables, cut bell peppers in half lengthwise; discard seeds and membranes.
Place pepper halves, skin sides up, on a foil-lined baking sheet; flatten with hand. Broil 15 minutes or until blackened.
Place in a zip-top plastic bag; seal.
Let stand 15 minutes. Peel; set aside.
Preheat oven to 45
Combine oil, salt, 1/2 teaspoon black pepper, squash, and onion on a baking sheet; toss well.
Bake at 450 for 20 minutes.
Remove from oven; combine squash mixture and garlic in a bowl.
Decrease oven temperature to 37
To prepare cheese mixture, combine cottage cheese and next 3 ingredients (cottage cheese through oregano) in a bowl.
To prepare white sauce, place flour in a medium saucepan. Gradually add milk; stir with a whisk.
Place over medium heat. Cook until thick; stir constantly.
Remove from heat; stir in 2 tablespoons chopped basil and 1/4 teaspoon black pepper.
Spread 1/4 cup white sauce in bottom of a 13 x 9-inch baking dish coated with cooking spray. Arrange 3 noodles over sauce; top with 1 1/4 cups cheese mixture, 1 cup spinach, 4 bell pepper halves, 2 cups vegetable mixture, and 1/4 cup white sauce. Repeat layers, ending with noodles.
Spread remaining white sauce over noodles. Cover and bake at 375 for 15 minutes. Uncover; sprinkle with mozzarella cheese.