To prepare a Uncle Dicks mashed potatoes recipe, first you'll need to prepare the potatoes. First, you will need the following ingredients: 12 cup butter, 2 tablespoons milk, 1 teaspoon salt, and 1 tablespoon pepper to taste. Melt the butter over medium-low heat. Add the onion and cook until the onions are translucent, about 5 minutes. Stir in the sour cream and milk. Bring the mixture to boil, then reduce the heat to low and simmer for 30 minutes, stirring occasionally. Remove the pan from heat and stir in 1 cup shredded cheddar cheese and 1/4 cup chopped chives. Season with salt and pepper. Serve warm.