Preheat your oven to 350°F (175°C) and prepare a muffin tin by spraying it with cooking spray or lining it with muffin liners.

Crack the eggs into a mixing bowl and whisk until uniform and slightly frothy, about 1-2 minutes.

Add cottage cheese, shredded cheddar, and grated parmesan to the eggs, and stir until well combined.

Fold in the chopped spinach, diced red bell pepper, and finely chopped chives, and sprinkle with salt and pepper.

Spoon the mixture into the muffin cups, filling them about three-quarters full.

Bake in the preheated oven for 20-25 minutes or until golden and set in the center.

Allow the muffins to cool in the tin for about 5 minutes before transferring them to a wire rack to cool completely.