Leave the chocolate and butter mixture to cool a little while you whisk the eggs and caster sugar in a large bowl using electric beaters. Once the mixture is pale, fluffy and looks like it’s roughly doubled in volume, whisk in the melted chocolate. Fold in the flour, cocoa powder and mixed spice until no pockets of flour remain then pour into your prepared tin. Level the top with a spatula and bake for 20-25 mins. The top should look set and shiny but should be a little wobbly if you gently jostle the tin.
Healthy chocolate brownies
Heat the oven to 190C/170C fan/gas 5 and line a shallow 23cm square baking tin with baking parchment. Tip the beans, cocoa, coffee granules, xylitol, vanilla, eggs and yogurt into a large bowl. Blitz using a hand blender until smooth. Or, do this in a food processor. Add the baking powder, then blitz again.