Preheat the oven to 325.
Beat the 3 eggs for 30 seconds and then add the cake mix, beer and vegetable oil.
Continue beating for another 2 minutes. Be sure to scrape the sides.
Spoon into a greased (or paper lined) cupcake pan, leaving about a half inch at the top.
Bake for 25 minutes.
While the cupcakes are cooling, whip the cream with the vanilla and sugar until it forms soft peaks.
Slice cupcakes in half and top with whipped cream and sliced berries.