Pre-heat oven to 350 degrees. Spray a muffin tin with non-stick cooking spray.
Divide desired toppings evenly among the 12 muffin molds. Fill the molds with egg whites until the egg whites reach about 1/4" below the top of each mold. Top with salt and black pepper.
Bake at 350 degrees for 20 minutes or until the egg whites are solid and cooked through.
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