Home › Soup › Leftover Potato Soup Leftover Potato Soup RECIPE BY Guest Contributor Good for using up leftover mash PREP 0 min COOK 0 min TOTAL 0 min YIELD 0 JUMP TO RECIPE SHARE Facebook Share on Facebook Twitter Share on Twitter Pinterest Share on Pinterest Email Share via Email Ingredientsgood knob butter1 large onion, chopped1.25kg (2 3/4 lb) leftover mashed potatoes1L (1 3/4 pints) chicken stock100ml (4 fl oz) semi skimmed milksalt and freshly ground black pepper to tasteInstructions Step 1: In a medium soup pot, melt butter over low heat, and sauté onions until tender. Stir in the mashed potatoes, and then slowly add the chicken stock. Stirring, add milk (use more or less to achieve desired creaminess). Cook until heated through and season with salt and pepper to taste. Share: Facebook Share on Facebook Twitter Share on Twitter Pinterest Share on Pinterest Email Share via Email