Preheat your oven to 300°F (150°C).
Grease a muffin tin or use silicone molds.
Cook any desired mix-ins (e.g., bacon, veggies) separately and set aside.
In a mixing bowl, whisk together eggs, milk or cream, salt, and pepper until well combined.
Distribute the cooked mix-ins evenly into the greased muffin tin or silicone molds.
Fill each mold about 3/4 full with the prepared egg mixture.
Sprinkle shredded cheese on top of each egg-filled mold.
Place the muffin tin in the preheated oven.
Bake for 20-25 minutes until the egg bites are set and slightly golden on top.
Allow the egg bites to cool for a few minutes.
Carefully remove them from the molds.
Serve warm and enjoy your customizable egg bites!