Preheat oven to 350°F (175°C). Grease a 12-cup muffin tin very well with nonstick spray.
Add the eggs, cottage cheese, and salt to a blender. Blend until smooth and creamy.
Pour the mixture into a bowl. Stir in the chopped sun-dried tomatoes, spinach, and basil.
Divide the mixture evenly between the muffin cups, filling each about three-quarters full.
If desired, sprinkle each cup with a little feta and black pepper.
Bake for 20–22 minutes, or until the centers are set and the tops are slightly puffed.
Let the egg bites cool in the pan for at least 5 minutes. They may deflate a bit as they cool.
Serve warm, or cool completely and refrigerate in an airtight container for up to 5 days.