– Cook spaghetti according to package directions, set aside. – Heat a large skillet over medium heat. Add olive oil, onions, and garlic – saute for 3-5 minutes, until the onions are slightly translucent. – Add the broccoli, zucchini, oregano, crushed red pepper, and salt/pepper to taste. Cook for 5-10 minutes until all of the vegetables have cooked through. – Heat the spaghetti sauce in a small pot over low heat. Add the diced red bell peppers to the sauce, simmer for 10 minutes.