This is the standard family recipe. I am very big on garam masala these days, so I might try subbing that for the cinnamon this year. Use a garam masala that doesn’t have any coriander in it, for the obvious reasons.
1 quart vanilla ice cream, softened
1# butter, softened
1 t cinnamon
1 t nutmeg
1# brown sugar
1# powdered sugar
Blend all ingredients. Freeze. Throw a fat tablespoon in with hot water and a shot of rum. Happiness.