01 -
Preheat the oven to 375°F (190°C) and grease a mini muffin tin with non-stick spray.
02 -
In a mixing bowl, whisk together egg whites, diced bell peppers, diced onions, shredded cheddar cheese, salt, and pepper until just combined, being careful not to overmix.
03 -
Spoon the mixture evenly into the prepared mini muffin tin, filling each cup about three-quarters full.
04 -
Bake in the preheated oven for 15 to 20 minutes, or until the bites are set and lightly golden on top.
05 -
Allow the egg white bites to cool slightly before removing from the tin. Serve warm or store for later use.