In a skillet prepared with cooking spray, saute peppers and onions over medium heat. Season with salt and pepper. Cook 3-4 minutes, until peppers and onions are tender and lightly caramelized. Stir frequently to avoid burning the peppers and onions. Note: If you don't have a spiralizer, you can thinly slice the peppers and onions with a knife. If you choose to create veggie spirals, roughly chop them before adding them to the pan to make them easier to manage.