01 - Preheat oven to 350°F. Lightly grease a 12-cup muffin tin with nonstick cooking spray or line with silicone liners.
02 - Add cottage cheese, eggs, cheddar cheese, Parmesan, salt, pepper, and garlic powder to a blender. Blend until completely smooth and creamy, approximately 30-45 seconds.
03 - Combine chopped spinach, diced bell pepper, sliced green onions, and any optional add-ins in a mixing bowl.
04 - Pour the blended egg mixture over the vegetables. Gently fold together with a spatula until evenly distributed, being careful not to overmix.
05 - Divide the mixture evenly among the 12 prepared muffin cups, filling each approximately three-quarters full.
06 - Bake for 22-25 minutes until centers are completely set and tops are lightly golden. A toothpick inserted into the center should come out clean.
07 - Let cool in the pan for 5 minutes before removing. Serve warm or at room temperature.