01 - Preheat oven to 350°F. Lightly grease a six-cup silicone muffin pan or line with paper liners.
02 - In a medium mixing bowl, whisk together the egg whites and cottage cheese until smooth and slightly frothy.
03 - Stir in the shredded cheddar cheese, baby spinach, diced red bell pepper, green onions, sea salt, black pepper, and smoked paprika if desired.
04 - Pour the mixture evenly into the prepared muffin cups, filling each about three-quarters full.
05 - Bake for 18 to 20 minutes, until centers are just set and tops have turned lightly golden.
06 - Let cool in the pan for 5 minutes before gently removing egg white bites. Serve warm or refrigerate for later.