8 lg. potatoes, peeled and cut into chunks
1 c. sour cream
6 oz. cream cheese, at room temperature
1 stick butter, at room temperature
1/2 c. milk
3 tbsp. onion salt
Salt and pepper to taste

Lightly butter 9x14 inch oval baking dish. Boil potatoes until tender, drain. Mash with electric mixer. Add sour cream, cream cheese, 5 tablespoons butter, milk, onion salt, salt and pepper. Put in baking dish, dot with remaining butter. Bake in preheated 400 degree oven until heated through and lightly brown, about 30 minutes.

Can be prepared 2 days ahead. Keep refrigerated.