Yukon Gold potatoes. Start with those, peel and chop, boil in water with a pinch of salt under tender. Drain thoroughly, throw back into your pot with: Real Butter, Half and Half, Coarse* black pepper, 1/2 teaspoon salt, some chopped chives, and some sour cream. After you mash them, grease a baking dish. Preheat your oven to 375 degrees. Now comes my mom's secret: Add 1 beaten egg to the mashed potatoes. Mix together, pour into the baking dish and slide into the oven for about 25 minutes or until the top becomes a light golden brown.