01 -
Set the oven to 350°F. Spread butter on a half sheet pan, lay some parchment over it, then butter that parchment too.
02 -
Blend flour, salt, and baking powder together in a bowl.
03 -
Beat the butter with sugar until it’s light and fluffy. Add the eggs, one at a time, then the vanilla. Gradually combine the dry mix and buttermilk, alternating them as you go.
04 -
Pour the batter into the pan, spreading it evenly. Bake for about 15-20 minutes, or until the edges turn lightly golden. Cool it for 10 minutes, then pop it in the fridge for 20 minutes to chill.
05 -
Mix the butter with the marshmallow fluff until it’s smooth. Add the powdered sugar and vanilla, whipping everything together.
06 -
Cut heart shapes out of the cake using a 4-inch heart cutter. Pipe the filling onto half the hearts, top them with the other hearts, and freeze for an hour to firm up.
07 -
Melt the pink candy melts with coconut oil until smooth. Dip the frozen hearts in the melted candy to coat, and chill again for 15 minutes.
08 -
Add fun swirls using the melted white chocolate on top. Chill once more to set.