LUCKY CHARM CUPCAKES: For St. Patrick’s Day or anytime you need a bit of good luck, make these easy cupcakes with Lucky Charms cereal on top. They’re magically delicious! What You Need: cupcakes; green frosting; marshmallow shapes from Lucky Charms cereal. How to Make It: Frost cupcake. Add Lucky Charms cereal & that’s it! Great for school treat!!!