Step #1
Combine all the heart shaped mixture ingredients in a bowl and stir until smooth. Transfer the mixture to a piping bag and pipe small hearts onto a sheet of baking paper cut to fit your tin.
Step #2
Place the sheet in the freezer for about 15 minutes or until the hearts have firmed up.
Step #3
Meanwhile, prepare the cake mixture in a separate bowl. Remove the baking paper from the freezer, set it into your baking tray and pour the cake mixture over the top.
Step #4
Bake in a preheated oven at 180°C for 10–15 minutes. Once baked, lift the cake from the oven, place it on a cooling rack, and gently peel away the baking paper.
Step #5
While it cools, make the buttercream filling.
Step #6
Cut the cooled traybake into squares and sandwich each piece with a layer of buttercream. Enjoy with a cup of tea.