With a whisk, beat the eggs, sour cream, ground mustard, milk, and salt & pepper.
Preheat an omelet pan on medium heat & melt the butter. Pour enough egg to
cover the bottom of the pan. Cook for a couple of minutes, then flip. Cover with
cheese, onions, & sausage. Roll up - then sprinkle a little hot sauce &
shredded cheese on top if you wish.