Preheat your oven to 350°F (175°C).
Grease a silicone muffin pan.
In a bowl, whisk the eggs and add milk, salt, and pepper.
Stir in cheese and diced vegetables.
Pour the mixture into the muffin cups.
Bake for 20 minutes until set and golden.
Let cool for a few minutes before removing.
Serve warm or store for later.