Cook ground beef in a medium sized frying pan. Drain fat and return to pan. Season meat with salt and pepper, add onion/onion flakes, and finely grate potatoes into pan.
Toss all for 1-2 minutes. Cover and cook over medium-low heat until potatoes and onion are soft; about 10 minutes.
Unroll crescents and pinch together 2 crescents to form a square. Place 1/4-1/2 cup meat mixture into center of square and fold up corners and pinch together connecting sides and pinch in a point at the top.
Place on greased baking sheet and bake 10-15 minutes or until crescents are baked. Freeze leftover bierocks.