Prep the pan: Heat oven to 350°F (175°C). Generously grease a 12-cup muffin tin or use silicone liners.
This helps prevent sticking.
Sauté veggies (optional but recommended): In a skillet with a little olive oil, cook peppers and spinach 2–3 minutes to remove moisture. Let cool slightly.
Blend the base: In a blender, add eggs, cottage cheese, Greek yogurt or milk (if using), salt, pepper, garlic powder, and onion powder. Blend 20–30 seconds until smooth and frothy.
Stir in mix-ins: Transfer the egg mixture to a bowl.
Fold in shredded cheese, cooled veggies, green onions, and cooked protein.
Fill the cups: Divide mixture evenly among muffin cups, filling about 3/4 full. Sprinkle a pinch of paprika on top if you like.
Bake: Bake 18–22 minutes, until the centers are set and just barely jiggle. They will puff in the oven and settle as they cool.
Cool and release: Let sit 5 minutes, then carefully run a knife around the edges to release.
Move to a rack to cool completely.
Serve or store: Enjoy warm, or pack for later. Add fresh herbs right before serving for a bright finish.