Super fluffy and loaded with your favorite fillings, these Breakfast Egg Muffins are so easy to make and super healthy for you! Scrambled eggs are whisked together, poured into a muffin tin, and then baked in the oven to make the cutest mini egg frittatas. This low-carb and keto egg cup recipe is a great base for a ton of filling options: bacon and cheddar, ham and Swiss cheese, or a veggie version with tomatoes and spinach!