We don't recommend adding additional ingredients to this recipe as it was tested to come out just right as is. Molten chocolate cake recipes are carefully tested to make sure they bake properly and they can be sensitive. We work hard to make sure that they don't come out too runny or too cakey, but rather with the perfect chocolate center.
If you want extra strawberry flavor you could try to spread a very thin layer of the jam over the cooled cupcakes before frosting. Or, you could experiment by stirring a little jam into the frosting.
Hope this helps.
Answered 02/08/2013 by bakingallthetime