Preheat your oven to 350°F (175°C).

In a mixing bowl, whisk together the eggs and milk until uniform and frothy. Add salt and pepper to taste.

Fold in the shredded cheese, diced vegetables, and cooked meat (if using).

Lightly grease a muffin tin and pour the egg mixture into each cup, filling about ¾ full.

Bake for 20 minutes until puffed and firm; a toothpick should come out clean.

Let the bites cool in the muffin tin for 5 minutes before removing them onto a cooling rack.