You could just eat them cold out of the container like I’ve been known to do, much to my kids’ horror, or try one of these:
Potato pancakes: Super easy lil’ yummy fritter type thing. Put cold potatoes in a bowl, mix in an egg to bind, add green onions, finely diced peppers (sweet or hot, multiple colors preferably, makes things pretty), maybe a little garlic pepper. Form into small flat patties and cook them in oil in a frying pan until crisp and brown on both sides. Serve with ketchup, aioli, apple sauce, sour cream, whatever.
Soup: Quick but delicious potato soup. Sautee until soft and fragrant some shallots or diced onion in a small amount of oil or butter, maybe add some red bell peppers for color and taste. Leeks would be awesome here, but I rarely have those laying around. Add potatoes. Thin out to soup-like consistency with combo of broth and milk. Toss in other stuff if you want or have things you need to use up. Corn, green peas, asparagus – all good here. Diced ham or bacon would be tasty if you want it meaty. Correct seasonings and warm until it is as hot as you like it.
Quesadilla: I know this one sounds weird, but trust. Small bit of oil in a frying pan over medium heat, flour tortilla rubbed around the pan to get the pan and the tortilla greased up. Keep pan low-medium because you don’t want to burn the tortilla while you are still filling it with awesome stuff. Spread mashed potatoes all over tortilla and top with other goodies (meats, veggies, cheese). The potatoes act like the “glue” to seal the quesadilla together, which in my opinion, is a way better vegan option than those weird milkless cheeses. Even though the cheese is not absolutely required to glue, doesn’t mean you can’t still add it! I’m all about gilding the lily. Cook until golden and then fold over into quesadilla shape. These work for any meal, but are especially great for breakfast stuffed with scrambled eggs or tofu, sausage, salsa, whatever else sounds good.