Dice the tomatoes, zucchini, and bell peppers and set aside. Chop the onions and mince the garlic.
Heat 1 tablespoon of olive oil in a small saute pan over medium heat. Add the onion and garlic and saute for 3-5 minutes. Remove from heat.
Meanwhile, preheat the oven to 375 degrees. Spray an 8 x 8 baking dish with cooking spray and set aside.
Place the tomatoes, bell peppers, zucchini, onions, and garlic in the baking dish. Sprinkle with Italian seasonings, oregano, salt, and pepper. Toss to combine.
Top the vegetables with the Parmesan cheese, Pecorino Romano cheese, and breadcrumbs.
Place in the oven and bake for 25-30 minutes or until the cheese is melted and the top is a golden brown.