Nanaimo Bars

1. Start by making the biscuit base. In a bowl, over a pan of simmering water, melt the butter with the sugar and cocoa powder, stirring occasionally until smooth. Whisk in the egg for 2 to 3 mins until the mixture has thickened. Remove from heat and mix in the biscuit crumbs, coconut and almonds if using, then press into the base of a lined 20cm square tin. Chill for 10 mins.
   2–3 minutes10 minutes
2. For the middle layer, make the custard icing; whisk together the butter, cream and custard powder until light and fluffy, then gradually add the icing sugar until fully incorporated. Spread over the bottom layer and chill in the fridge for at least 10 mins until the custard is no longer soft.
   10 minutes
3. Melt the chocolate and butter together in the microwave, then spread over the chilled bars and put back in the fridge. Leave until the chocolate has fully set (about 2 hrs). Take the mixture out of the tin and slice into squares to serve.
   2 hours

Cooking notes

Baked goods are unforgiving with rounding — use weights rather than volumes whenever possible, and verify pan capacity if you scale up or down significantly.

For volume-to-weight conversions of any ingredient — flour, sugar, butter, salts — use the ingredient converter. To translate the recipe's oven temperature between °C, °F and gas mark, see the temperature converter.

When you scale this recipe up or down, remember that cooking time does not scale linearly. A doubled cake takes longer, but not twice as long; a doubled soup takes roughly twice as long. The cooking-time guide gives sensible starting estimates by dish geometry.