Bring a large pot of salted water to a boil. Add potatoes and cook until tender, 20 to 30 minutes.
With an electric mixer on low, blend potatoes, slowly adding milk, about 1/2 a cup at a time. Use more or less to achieve desired texture. Add butter and maple syrup to taste. Blend until smooth. Serve warm.
Aluminum foil can be used to keep food moist, cook it evenly, and make clean-up easier.