Chai Spice Mix
1 1/2 tsp. ground cardamom
1 1/2 tsp. ground cinnamon
1/2 tsp. ground ginger
1/4 tsp. ground cloves
1/4 tsp. ground nutmeg

Cupcake Batter
1/2 cup (1 stick) butter
1 cup sugar
2 tsp. vanilla bean paste (or pure vanilla extract)
2 eggs
2 tsp. chai spice mix
1 1/4 cups plain flour, sifted
1/2 cup buttermilk
1/2 tsp. baking soda
1/2 tsp. apple cider vinegar

Buttercream
1 cup (2 sticks) butter, softened to room temperature
1 tsp. vanilla bean paste (or pure vanilla extract)
2 cups powdered sugar
remainder of the chai spice mix
1 Tbsp. cold milk, if needed to thin out the buttercream