Ground Beef Potato Skillet

About as basic as they come.  I almost hate to admit I had to find a recipe for this.  Be sure to cook the beef in the same skillet with the potatoes as it does improve the overall flavor of the dish.

2 T butter
2-3 medium russet potatoes, diced
1/4 medium sweet onion, chopped
1 pound ground beef
1/2 tsp or more salt to taste
freshly ground black pepper

Heat butter in a cast-iron skillet over medium-low heat.  Add diced potatoes and cook for twenty minutes or more, stirring once or twice, until potatoes are cooked through and golden brown.

Add ground beef, onion, and salt and pepper to taste.  Cook until juices run clear; drain off excess fat.  Serve hot.