Like any vegetable, if you want delicious potatoes, grow them, go to farmers markets or purchase them mid summer to fall. I have just recently noticed that potatoes have a prime time - they do store well, but don't taste near as good in winter or spring . Nancy.
Mashed Potatoes - Boil in salted water until they can be pierced with a fork. Add just a little butter an milk and perhaps a clove or two of garlic or chives and mash with a potato masher.
Roasted Potatoes - Cube potatoes, sweet potatoes and beets and toss in a light layer olive oil with slat and pepper. Place in vegetable basket if grilling or on cookie sheet if baking in a 400F oven. Bake until they are soft when pierced with a fork (about 20-25 minutes usually) and if they do not have golden brown edges they are best if you put them under a broiler a few minutes.
Oven fries - (The best excuse to eat catsup!) Slice the potatoes into 1/4 inche rounds or in long 1/2 inch thick slices and toss in a couple tbsp of olive oil. Place in single layer on cookie sheet. Generously sprinkle with kosher salt and a little bit of pepper. Bake at 400F for 20-15 minutes until crispy on the outside but still soft on inside. Sweet potatoes are good this way too.