Heat a large skillet over medium heat. Add olive oil, onions & garlic – saute for 3-5 mins, until the onions are slightly translucent
Add the remaining veggies along with salt & pepper to taste. Cook for 5-10 mins 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.