My favorite way to make mashed potatoes is with red potatoes and fresh garlic.
Garlic Mashed Red Potatoes
Small bag red potatoes (washed and cubed, not peeled)
4 cloves garlic (peeled and pressed)
1 stick butter
1/2 to 1 cup sour cream
2 Tbsp parsley
salt and pepper to taste
Boil potatoes with garlic until soft. Drain the water. Mash and mix with a hand mixer. Add butter and allow it to melt for a few minutes, then add milk, sour cream, salt, pepper, parsley. Blend with the mixer until smooth.