Strawberry shortcake is a classic dessert that kids love. To make this birthday cake version, start by baking a light and fluffy sponge cake. While the cake is cooling, prepare the strawberries by slicing them and tossing them with sugar. Whip up some fresh cream and set aside. Once the cake has cooled, slice it in half horizontally and layer it with the sweetened strawberries and whipped cream. Place the top layer of cake on top and frost the entire cake with more whipped cream. Garnish with fresh strawberries and mint leaves for an elegant touch.