I'm not sharing the recipe, because we won't be having it again. It was the one where you cook flour and milk and then add it to your butter/shortening and sugar. It didn't become nice and creamy and thick. Instead it separated and was grainy.
It tasted fine, however, and a little graininess wasn't going to stop us from enjoying a delicious dessert. Next time, though, we'll go with a marshmallow fluff filling of some sort.