Preheat the oven to 350 degrees F (175 degrees C). Spray a 12-cup muffin pan generously with cooking spray.
Combine egg whites, cottage cheese, garlic powder, salt, and pepper in a blender; blend until smooth, about 15 seconds.
Combine spinach, roasted red peppers, and basil in a bowl. Pour in egg mixture and stir to combine. Ladle the mixture evenly into the muffin cups, filling each about 3/4 full. Top each muffin with 1 teaspoon feta cheese.
Bake in the preheated oven until egg white bites are set, 18 to 20 minutes.
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