Place bullion cubes in pot with six cups water. Add turkey leg. Cover and bring to a boil, reduce heat and simmer thirty minutes.
Place butter in large skillet over medium heat. Add onion, celery, and garlic. Saute until lightly browned.
Remove turkey leg from broth and dice up when cool. Add instant potatoes to broth and stir. Add onion mixture, beans, and diced turkey. Stir in salt and pepper. Bring to a boil, stirring constantly, and reduce heat to simmer for thirty minutes before serving.