Preheat oven to 176*C.
In a large mixing bowl, whisk together flour, graham crumbs, baking power, and salt.
In your mixer bowl, beat together butter and sugar until fluffy.
Add eggs one by one until combined then add vanilla extract.
Add 1/2 of the flour mixture, and beat in 1/2 of your buttermilk mixture.
Repeat again for the other 1/2, and mix until just combined.
Fill liner 3/4 full and bake at 176*C for 22-25 mins.
Allow to cool in pan for 10 mins before removing to cool completely on wire rack.
Fill cupcake using a filling nozzle (wilton #230) or Squeeze bottle with a pointy nozzle.
Just poke it in the middle of cupcake and squeeze until it plump up.
Make your frosting only when you are ready to frost.