While the meatloaf is cooking, make the mashed potatoes. Place potato in a saucepan; cover with water. Bring to a boil; cover, reduce heat, and simmer 10 minutes or until tender, Drain. Put potatoes into a ricer for best results. Return potato to pan. Add milk and remaining ingredients; stir with a spoon to desired consistency. If the mixture is not creamy enough, add up to 1/4 cup more milk (needs to be stiff enough to pipe on top of the meatloaf)