Set aside to cool. I was concerned at how loose and buttery this mixture was, thinking the measurement of flour or butter was incorrect, but it bakes up just fine.
For the filling, place icing sugar, shortening, milk and peppermint essence in a bowl and mix until well combined. You will need to almost beat in the kremelta so it absorbs into the mixture to create a smooth consistency. The recipe didn’t actually specify melting the shortening which was odd, so I melted it and it turned out perfect.