3 buttermilk mashed potatoes sauteed Recipes

potatoes, peeled and cubed (2-inch - 3-inch cubes ), olive oil, leeks, whites and light greens, cut into 1/4-inch slices and rinsed, fresh rosemary or 1/2 tsp dried rosemary, minced, fat-free buttermilk, slightly warmed, sea salt & freshly ground black pepper

leek, trimmed and cut in 2 horizontal pieces, olive oil, chopped peeled russet potato (about 2 lb), low-fat buttermilk (1%), neufchatel cheese, butter, salt, freshly ground black pepper