Set your oven to 350°F (175°C).
Let it heat up completely before baking.
This ensures even cooking throughout.
Grease your muffin tin with cooking spray.
Make sure each cup is well coated.
Add egg whites to your mixing bowl.
Whisk them until slightly frothy.
Add cottage cheese and mix well.
The cottage cheese adds creaminess and protein.
Blend until the mixture is smooth.
Fold in the shredded cheddar cheese.
Add bell peppers, spinach, and onions.
Season with salt, pepper, and garlic powder.
Mix everything together gently.
Don't overmix the ingredients.
Pour the egg mixture into each cup.
Fill them about three-quarters full.
They will puff up while baking.
Distribute the vegetables evenly among cups.
Place the tin in the preheated oven.
Bake for 20-25 minutes.
The tops should be golden brown.
A toothpick inserted should come out clean.
Let them cool for 5 minutes.
Run a knife around each bite carefully.
Pop them out of the tin gently.
Let them cool on a wire rack.
Store in an airtight container.