These are very sweet and very wicked – I guarantee your Dad will love ‘em!

Preheat oven to 180degC (160degC fan forced). Line the base and sides of a 20cm x 30cm slab tin with baking paper.
Place the chocolate squares and butter in a heatproof bowl over a saucepan of simmering water – don’t let bowl touch the water. Stir with a wooden spoon to combine well. Remove from heat when melted and set aside to cool.
In a mixing bowl, whisk the eggs with the caster sugar, vanilla extract and orange zest until light and fluffy. Stir in the cooled melted chocolate mixture, then fold in the sifted flours. Stir through the chopped nuts and white chocolate chips.
Spoon mixture into the prepared pan, spreading out evenly with a spatula.
Bake for 20-25 minutes until top has a firm crust. Leave to cool in the pan, dust with icing sugar, then cut into  squares.

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