Creamy Potato Soup

3 to 4 Cups Peeled and sliced potatoes,
3 Cups sliced leeks or yellow onions
2-3 quarts of water, just enough to cover potatoes and onions
2 t. salt
2 Chicken bullion
pepper to taste
3 T Butter
1/2 Pint cream

Bring potatoes and onions to a boil in salted water. Reduce heat and simmer partially covered for about 45 minutes, or until potatoes are tender. Put through a food mill or blender and return to pot. Add black pepper, butter and cream. Heat and serve. Serves 6 to 8.