Grab & Go: Egg White Bites. These are perfect for quick morning! I sauteed the pepper and onions in a little butter first so they weren't as crunchy and added just a little bit of mozzarella cheese to each for a little more flavor. One carton on egg whites makes two mini muffin pans. I baked them at the same time for about 15 minutes. Just reheat them in the microwave for about a minute and serve with salsa.