Preheat your oven to 325°F. A slightly lower temperature helps the egg bites cook gently and stay custardy, not rubbery.
Grease your muffin tin well or line with silicone muffin cups. Be generous with the oil or spray. You’ll thank yourself later.
Add the eggs, cottage cheese, shredded cheese, salt, pepper, and garlic or onion powder to a blender. Blend on medium until smooth, 20 to 30 seconds. The cottage cheese curds will disappear into the mix, and you’ll get that creamy Starbucks-style texture.
Prep your mix-ins. If using spinach or bell peppers, chop them small so they distribute evenly. If using bacon or sausage, make sure they’re cooked and drained. Moisture is the enemy of fluffy egg bites, so pat veggies dry if they’re wet.
Divide the mix-ins evenly amongst the muffin cups. This trick keeps every bite balanced. It also helps prevent clumping at the top.
Pour the egg mixture over the mix-ins, filling each cup about 3/4 full. Give the pan a gentle tap on the counter to release any big air bubbles.
Optional but helpful: Place the muffin pan on a baking sheet, then pour a little hot water into the sheet to make a quick water bath around the pan. This adds steam to the oven and keeps the egg bites silky.
Bake for 18 to 22 minutes, until the centers are just set and a toothpick comes out mostly clean. They will puff a bit in the oven, then settle as they cool.
Let the egg bites rest in the pan for 5 minutes. This makes them easier to remove without tearing. Run a thin spatula or butter knife around the edges if needed.
Serve warm, or let cool and refrigerate for later. They reheat like a dream.