You can either crumble the cake into large crumbs or using a very small cookie cutter cut a two-inch piece of cake and make it into a circle shape.

Place two tablespoons of vanilla frosting into the bottom of each mason jar. Then sprinkle some colorful sprinkles on top and add the cake. Then add sprinkles and more icing until the frosting reaches the top of the mason jar.

Top with whipped cream.

Refrigerate until serving.