Preheat oven to 325 degrees.
Spray 12 muffin tins well with cooking spray. (Silicone muffin tins work especially well.)
Whisk together eggs, cottage cheese and a pinch of salt. Add potatoes. Divide among cups. Sprinkle cheese on top.
Bake for 25-30 minutes until firm.
You can customize individual egg muffins by adding different ingredients to each cup, e.g., cooked spinach, scallions, ham, turkey