In a large skillet, cook sausage over medium heat until no longer pink, breaking into crumbles; drain.
Stir in the flour, salt and ¼ teaspoon pepper until blended; gradually add ¾ cup milk.
Bring to a boil; cook and stir until thickened, about 2 minutes. Remove from heat and set aside.
In another large skillet over medium heat, cook potatoes in butter until tender.
Whisk together the eggs, garlic salt, and remaining milk and pepper; add to skillet.
Cook and stir until almost set.
Press biscuits onto the bottom and up the sides of 8 ungreased muffin cups.
Spoon the egg mixture, half the cheese, and the sausage into cups; sprinkle with remaining cheese.
Bake at 375° until golden brown, 18-22 minutes.
Cool 5 minutes before removing from pan.
