Preheat the oven to 350°F (175°C) and liberally grease a 12-cup silicone muffin tin with cooking spray.
Place the eggs, cottage cheese, salt, and black pepper into a high-speed blender.
Process on medium speed for 20-30 seconds until the mixture is completely smooth and slightly aerated.
In a mixing bowl, combine the blended egg mixture with the shredded cheddar, parmesan, chopped spinach, and diced bell pepper.
Divide the mixture evenly among the 12 muffin cups, filling each approximately 3/4 of the way to the top.
Bake for 22 to 25 minutes, or until the egg bites have risen and the centers are firm to the touch.
Remove from the oven and allow to cool in the silicone pan for 5 to 10 minutes to allow the structure to set before depanning.