Pro Tips: This recipe has one non-negotiable tip: DO NOT use mint extract. It tastes like toothpaste! Use peppermint extract for authentic, sweet Shamrock Shake flavor. For the brightest green color, use gel food coloring instead of liquid. For the frosting, ensure your heavy cream is very cold for the stiffest, most stable peaks. Cool cupcakes completely before frosting, and add sprinkles and cherries right before serving to prevent them from bleeding or dissolving.