Preheat your oven to 180C/160C Fan and line a 9x9inch square baking tray with parchment paper.
Melt together the butter and dark chocolate together in a heatproof bowl over a pan of boiling water, on the microwave in 20 second bursts until melted. Leave on the side to cool whilst you do the rest.
Using an electric whisk/stand mixer, whisk together the eggs & caster sugar for a few minutes until the colour has turned pale, is very mousse like, and is double the original volume of the amount of eggs + sugar! You will know its done because when you lift the whisk up out of the mix it should leave a trail for a couple of seconds before disappearing!
When whisked, pour the cooled chocolate/butter mix over eggs and fold together carefully.
Once completely combined, add the cocoa powder, malt powder, and plain flour on top of the chocolate mix and then fold together again – still be careful to not knock out the air!
Fold through the milk chocolate chunks, and pour into the tin. Add in dollops of the Malteser spread and swirl slightly.
Bake in the oven for 25-30 minutes. Some ovens can take longer, such as up to an hour! Once baked, leave to cool in the tin completely.
Once cooled, drizzle over 100g of chocolate, and add on a mini Malteser bunny for each slice. Crush over some Maltesers. Once the chocolate is set, slice them up!
Notes
Depending on your ovens, or how you mixed the brownies up, some can take up to an hour to bake successfully. I’ve never fully understood why, but don’t give up if they’re not done after 30 minutes – cover with foil and continue to bake for longer. I poke a skewer through them and wait till its mostly clean, and the mixture doesn’t wobble in the tin.
If they've been in for an hour, but are still looking a bit undone, remove from the oven, cool completely, and leave in the fridge for an hour before cutting.
Warm these up in the microwave and serve with some ice-cream, a delicious dessert for any occasion!
These will last in an airtight container for up to 1 week if they last that long!
I used Malteser bunnies as it was Easter time when I made these, but you can easily decorate with just Maltesers as well!
You can bake Maltesers into the brownies as well if you wish, but I find that they basically dissolve when baked so there isn't much point.
I have made these using Horlicks, and Ovaltine and either work well!
Malteser spread can be found in supermarkets near the Nutellas and such!