The tried & true Lockhart recipe - very easy. I learned how over 80 years ago from a Baltimore elementary school classmate.
Hope you had a happy St. David''s Day (the patron saint of Wales - March 1), a happy St. Patrick's Day (right now in Australia, tomorrow in the USA) and a happy St. Andrew's Day (patron saint of Scotland - April 1)!
BUTTER CREAM IRISH "POTATOES"
Bring 1 cup (two sticks) butter or margarine to room temp.
Sift 3 lbs confectioners (10-X) sugar into a LARGE bowl. Work the room temp butter or margarine through with your fingers until it is dispersed throughout, with the largest butter/marg bit no larger than a small pea.
Make a well and add 1/3 cup whole milk plus 1 tsp vanilla extract, working throughout. Mixture will be "dry."
Slowly add more milk, 1 tablespoon at a time, until the mixture is creamy but not wet. We add shredded coconut to taste.
Pinch off a scant tablespoon of the butter cream, roll into a "potato" and dredge it in either pure cinnamon (as we do) or in a mixture of cinnamon and 10-X sugar (less intense).
Store in a airtight container in a cool, not cold, place