Preheat the oven 170C/ 325F/ GM3 and line a cupcake tray with 10 paper cake cases (or use 6 supersized cupcake cases on a baking sheet)
Using electric beaters, beat the butter and sugars together until light and fluffy
Briefly mix the eggs in a jug and gradually add a tsp at a time into the creamed butter & sugar, beating well in between each addition (adding the egg really slowly reduces the risk of the mix splitting)
Add the vanilla extract and milk, then beat again
Sift the flour, baking powder and malted milk powder into the bowl and gently & briefly fold in half using a large metal spoon (about 8 turns of the spoon). Add the rest of the flour and continue to fold in until all ingredients are thoroughly combined. Take care not to overwork the batter though
Divide between the cupcake cases - filling each case around 2/3 full - and bake for approximately 20 minutes (23 minutes for the larger cupcakes)
Test that the cupcakes are baked through: poke a cocktail stick into one of the cakes - if it comes out clean then the cakes are ready. If not, return to the oven for a couple more minutes, then test again
Put the butter into a medium bowl and beat until smooth and soft
Add the malted milk powder and beat again then add the milk and vanilla extract. Beat until smooth
Sieve in the icing sugar 1 tbsp at a time and beat well between each addition
Once the cakes have cooled completely pipe the buttercream on them and garnish with a Malteser. Store in an airtight container at room temperature for up to 2 days
Just before serving break up a few additional Maltesers and scatter over the cakes (don't be tempted to do this too early, since the honeycomb goes soft quickly)
I have used standard Horlicks (malted milk powder) in this recipe. Ensure you do not pick a light version. Also ensure you do not use Ovaltine or a chocolate flavoured Horlicks.
The cupcake cases shown in the photographs are larger than standard cupcake liners. They make cakes that are approximately 1.5 x the size of a standard cupcake.
The cake mix as listed will make either 10 regular cupcakes or 6 supersized cupcakes buttercream measure.
When it comes to the buttercream, there is sufficient to frost 10 regular cupcakes but you will need less if making 6 supersized cupcakes. Try making 2/3 of the listed buttercream recipe.
Maltesers do go soft and stale quickly once cut open. For this reason, scatter Malteser fragments over the cakes just before serving to ensure the fresh crunch is retained.