Salt and pepper. Lay a slice of cheese on top. Do not cover. Cook on hot grill until hashbrowns are brown on the bottom and cheese begins to melt. Remove and place on top of toast.
Eggs are optional.
Place the hashbrowns on the grill and spread thinly, with an indentation in the center. Break egg into indentation and allow to start cooking. As egg white begins to firm, and yolk begins to cook, sprinkle with salt, pepper. Just before the egg looks done, sprinkle with onions, then place cheese on top and cover until cheese is melted. Lay the whole works on top of toast.