Creating Loaded Egg Muffins is straightforward if you follow these simple steps:

1. Preheat Oven: Preheat your oven to 375°F (190°C). If using a muffin tin, spray it with non-stick cooking spray or line with muffin liners.
2. Whisk Eggs: In a large bowl, crack the eggs and whisk them together with the milk, salt, pepper, and garlic powder until well combined.
3. Add Fillings: Stir in the diced bell peppers, chopped spinach, shredded cheese, and, if desired, crumbled bacon or sausage. Mix until well distributed.
4. Fill Muffin Tins: Pour the egg mixture evenly into each muffin cup, filling them about ¾ full. The mixture will expand while baking.
5. Bake: Place the muffin tin in the preheated oven and bake for 18-20 minutes, or until the muffins are set and golden on top.
6. Cool: Remove the muffin tin from the oven and let the muffins cool for 5 minutes before transferring them to a wire rack to cool completely.
7. Store: If not eaten immediately, store the muffins in an airtight container in the refrigerator for up to one week, or freeze for longer storage.

These steps will guide you through creating amazing Loaded Egg Muffins with ease!