Place potato in a saucepan, and cover with water. Bring to a boil. Reduce heat; simmer 15 minutes or until tender.
Drain and return potato to pan. Add half-and-half, butter, and juice; mash to desired consistency. Cook 2 minutes or until thoroughly heated, stirring constantly.
Remove 2 chiles from can and chop; reserve remaining chiles and adobo sauce for another use. Stir chopped chiles, brown sugar, salt, and 1/2 teaspoon cinnamon into potato mixture. Sprinkle with 1/4 teaspoon cinnamon.