Mix brownie mix according to package. Line 12 muffin tins with cupcake liners, fill liners 2/3 to the top with brownie mix. Bake brownie cupcakes for 15-18 minutes at 350 degrees. Let cool completely before frosting
For Buttercream Frosting
Beat 2 softened sticks of butter with 2 boxes of confectioner’s sugar, and add 1 t. vanilla.
Use a large frosting tip to pipe frosting on to cooled cupcakes. Top frosting with whipped cream, chocolate syrup and sprinkle with lots of rainbow jimmies!
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