Combine all the ingredients into a blender with cubed ice and blend until smooth.
Pour into a Moscow Mule mug.
Garnish with an apple slice and a cinnamon stick.
*Cinnamon-vanilla syrup: In a saucepan, bring 2 cinnamon sticks, 1 tsp vanilla extract, 3/4 cup water and 3/4 cup turbinado sugar to a boil. Stir until the sugar dissolves. Let sit for 10 minutes. Strain into a sealed container and refrigerate for up to 1 month.