Preheat oven to 350°F and grease a 12-cup muffin tin. In a blender, combine eggs, cottage cheese, milk, salt, and black pepper and blend until smooth. Stir in shredded cheese and any desired mix-ins. Pour mixture evenly into muffin cups, filling each about 3/4 full. Bake for 18–22 minutes until set and lightly golden. Let cool for 5 minutes before removing. Serve warm or store for meal prep.
Notes
Do not overbake to prevent dryness. Use silicone liners for easier removal. Store in refrigerator up to 4 days or freeze for up to 2 months.