Start by chopping the spinach, basil, and sun-dried tomatoes. Make sure the tomatoes are drained well to avoid excess oil. Gather your eggs, cottage cheese, and seasonings so everything is ready.
In a blender, combine eggs, cottage cheese, and salt. Pulse just until smooth; over-blending can make the bites dense. The mixture should be creamy and slightly thick.
Fold in spinach, basil, and sun-dried tomatoes gently. Spray the muffin tin with cooking spray and fill each cup about 80% full. They will puff up while baking but deflate slightly afterward.
Bake at 350°F (175°C) for 20 minutes until firm and lightly golden. Sprinkle crumbled feta and black pepper on top immediately after baking for extra flavor. Let them cool slightly before serving.