Preheat your oven to 375°F (190°C) and grease a muffin tin with butter.

In a large bowl, whisk together the eggs, milk or cream, salt, and pepper until well combined.

Add the chopped chicken sausage, mixed veggies, cheese, black pepper, and salt to the egg mixture. Stir to combine.

Pour the egg mixture evenly into the greased muffin tin, filling each cup about three-quarters full.

Bake for 20-25 minutes, or until the egg muffins are set and slightly golden on top.

Let the muffins cool in the tin for a few minutes before removing them. Serve warm.