Not sure if muffin batter was this one or from
https://www.ifyougiveablondeakitchen.com/apple-spice-cupcakes/#recipe
* Not enough apple though, try Granny Smith.
* Crumble - don't melt butter, didn't work had to remake.
* Piped Carnation caramel in centre to zhush up as crumble lost texture after freezing.
