My Wonderful Strawberry Cupcakes with homemade strawberry buttercream icing

I was in a cupcake making mood, so i had all the ingredients. So i made the cake mixure(strawberry) and then added the strawberries, you need to use sweetened frozen strawberries because fresh strawberries make it bitter. then I buy most of the time the alum. cake cups because you can put them on a cookie sheet and they stand on their own. and the icing is just 5 cups of powered sugar, 2 sticks of real butter and as much strawberry mixture you want. after you mix the frosting and it is still to runny add powered sugar till you reach the consistancy you want, and you want it a little stiff to stay on top of the cupcake. and i just use a gallon baggie to put my icing in, i like my tops messy and full.