Cinnamon Toast Crunch Cupcakes

Ingredients

FOR CUPCAKES:

1 box vanilla cake mix, plus ingredients called for on box

1 tsp. ground cinnamon

1/4 c. cinnamon sugar

1 c. Cinnamon Toast Crunch cereal

FOR FROSTING:

1 c. (2 sticks) butter, softened

3 c. powdered sugar

Pinch of kosher sal...