Preheat the oven and prep the pan. Preheat the oven to 350°F. Spray muffin tin with nonstick cooking spray.
Whisk the ingredients. In the mixing bowl add the eggs and whisk. Add the dry mustard, salt, and pepper, blend. Add the ham, hashbrowns, cheese, milk, and sour cream. Whisk until combined then pour into the muffin tin.
⭐️Bake. Bake for 20-25 minutes or until eggs are set. Serve with a little sour cream and cheese on top if desired.