Preheat your oven to 180ºc/160ºc fan and grease and flour, or cut mini circles and line the bottoms of your cups in your 12-hole mini sandwich tin
Cream together the butter and caster sugar until smooth
Add in the eggs, flour, and vanilla and beat again until smooth
Spoon into the tin evenly per cake and bake in the oven for 16-18 minutes or until cooked through! Leave to cool on a wire rack fully and then remove from the tin carefully.
Beat the butter until smooth
Add in the icing sugar 1/3 at a time, making sure the sugar is fully incorporated each time until moving on
Add the vanilla, and then add 1 tbsp of boiling water at a time till you reach the desired consistency
Cut each cake in half carefully – using a piping bag, pipe on some buttercream for each cake. Spoon on some raspberry or strawberry jam, and then add the other half of each mini cake on top!
Decorate your cupcakes how you like – I melted over some white chocolate, and then sprinkled on some freeze dried raspberries/strawberries! – and ENJOY!