Mix the flour, sugar, baking powder and salt in a medium bowl.
Cut in butter using pastry blender until it is coarse crumbs.
Stir in milk until dough leaves the sides of the bowl.
Place dough on surface and knead lightly 10 times.
Roll or pat out to just under a 1/2" thick.
Cut with a 2" round cutter.
Press into muffin well and up the sides.
Bake for 10-12 min or until golden.
Gently press the biscuit with the back of a spoon to form a well.
FILLING:
Chop the onion and caramelize on a griddle or large skillet. Set aside when done.
Season steak with salt, pepper, and garlic powder to taste on both sides.
Thinly slice the steak (this works well when the steak is still slightly frozen). If your strips of steak are really long you may want to chop them some.
Cook steak to desired doneness on griddle or large skillet.
Now for assembly:
Fill each cup with steak.
Top with onions and a quarter of provolone cheese.
Put back in oven for 5 minutes or until cheese is melted.