Stove Top: Portions should be thawed for best results, but may be cooked from frozen. Set skillet over medium heat and place beef in skillet. Gently separate beef slices and mix in any desired toppings (onions, peppers, mushrooms). Once fully cooked, move beef slices together, molding them to bun length. Place cheese on top and allow to melt. Put open bun over beef and cheese. Place spatula under beef and bun and turn sandwich into upright position.
