1/2 gallon premium vanilla ice cream, softened
1 pound butter, softened (no substitute)
1 (1-pound) box powdered sugar
1 (1-pound) box dark brown sugar
2 teaspoon ground cinnamon
1/2 teaspoon ground nutmeg

Combine all ingredients and mixing well. Place in a freezer-safe container and store in freezer until ready to use. To serve: Place 1 ounce rum in mug with 2 tablespoons mix. Fill mug with boiling water and top with additional nutmeg, if desired.