In a small to medium pan, melt the butter over medium heat.
Stir in the dry rice and cook until it appears translucent.
Stir in the vanilla extract and cinnamon.
Combine the milk and cream in a glass measuring up. Add ¼ the mixture to the rice, stirring as it cooks and incorporates. Once the liquid is mostly absorbed, add more. This will take 20-25 minutes, have patience and continue to stir.
As you add the last addition of liquid, also add the sugar and stir into the pudding.
Taste a rice piece to check for doneness. Once cooked, remove from heat and cover the pan. Leave for 3-5 minutes.
Serve warm or cold.
Notes
You can cover and refrigerate any leftovers for at least 5 days.
You can easily double for triple this recipe for more servings.