This is what I make for holidays:
http://find.myrecipes.com/recipes/recipefinder.dyn?action=displayRecipe&recipe_id=257351
Harvest Mashed Potatoes.
Ingredients
* 4 large red potatoes (2 pounds)
* 2 medium-size sweet potatoes (1 1/2 pounds)
* 1/4 cup butter or margarine
* 1/2 cup milk
* 1/4 cup sour cream
* 1/4 cup freshly grated Parmesan cheese
* 1 tablespoon prepared horseradish
* 1/4 teaspoon salt
* 1/4 teaspoon pepper
* 1/4 teaspoon ground cinnamon
* 1/8 teaspoon ground nutmeg
* Butter or margarine (optional)
Preparation
Peel potatoes, and cut into 1-inch pieces. Cook in a Dutch oven in boiling salted water to cover 15 to 20 minutes or until tender; drain and place in a large bowl.
Add 1/4 cup butter and next 8 ingredients; mash with a potato masher until smooth. Top with additional butter, if desired.