You will use the tomato sauce above as the base for these vegetables.
Heat 2 tablespoons of olive oil in a large skillet.
Add the chopped veggies and red pepper flakes to the skillet.
Cook, stirring occasionally, until the veggies are tender - al dente - about 10 minutes. Season with salt and pepper to taste.
Stir in the prepared marinara and cook to heat through, about 2 minutes.
Serve with pasta, zucchini noodles or spaghetti squash.