In a medium frying pan over medium heat, cook the sausage into crumbles until browned. Drain and set aside.
Cut all the vegetables as instructed.
Spray a large baking dish (9x13 size) with nonstick cooking spray.
In a large bowl, combine the zucchini, squash, onion and drizzle the olive oil over the veggies.
Sprinkle the seasonings (basil, thyme, garlic powder, onion powder, salt, and pepper over the vegetables. Mix until all the vegetables are fully coated with seasonings.
Layer the vegetables in the baking dish starting with a layer of vegetables first.
In between each layer add a layer of cooked sausage crumbles.
Top each layer with mozzarella cheese and Parmesan cheese.
After the last layer of vegetables add tomato slices to the top of the vegetables. Finish the final layer with Parmesan cheese and mozzarella cheese.
Bake uncovered for about 35 to 45 minutes or until the vegetables are soft and tender. Be sure to place the dish in the center of the oven so the cheese doesn’t burn on top before the vegetables are done.