Preheat broiler. Wrap handle of 10-inch omelet pan or skillet with foil to make it ovenproof.

In skillet over medium heat, heat butter until just hot enough to sizzle a drop of water. Add potatoes and season with salt, if desired. Stir occasionally until lightly browned, about 5 to 7 minutes.

In small bowl, beat together eggs and water until blended. Pour over potatoes. Cover. Cook until eggs are almost set, 4 to 5 minutes. Sprinkle with cheese. Broil about 6 inches from heat until eggs are completely set and cheese melts, about 2 to 3 minutes. Cut into halves to serve.

Nutritional information per serving of 1/2 recipe using 6.5 oz. potatoes, salt, and Cheddar cheese: Calories 32 7, Protein 18 g, Carbohydrates 17 g, Total Fat 2 1 g, cholesterol 455 mg, Sodium 589 mg.