Blogger Baked Perfection has baked these strawberry-filled vanilla cupcakes with strawberry buttercream - go there for the recipe! She writes:
I made a filling for these cupcakes with frozen strawberries packed in syrup, but have since made a blackberry and raspberry filling using frozen whole berries that I let thaw sprinkled in a couple tablespoons of sugar and used the juice it extracted while thawing. If you don't want to make a filling you can use a high quality strawberry jam and it will be just as good and nobody will need to know it was not homemade. To fill the cupcakes I used the large end up a piping tip to cut out a round section in the cupcake. I then fill the cupcake and put the cut out portion of the cupcake back over the filling. Feel free to use a knife to cut out a section to fill.

I made a filling for these cupcakes with frozen strawberries packed in syrup, but have since made a blackberry and raspberry filling using frozen whole berries that I let thaw sprinkled in a couple tablespoons of sugar and used the juice it extracted while thawing. If you don't want to make a filling you can use a high quality strawberry jam and it will be just as good and nobody will need to know it was not homemade. To fill the cupcakes I used the large end up a piping tip to cut out a round section in the cupcake. I then fill the cupcake and put the cut out portion of the cupcake back over the filling. Feel free to use a knife to cut out a section to fill.

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