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Preheat the oven to 180°C (350°F) Gas 4.
Melt the chocolate in a heatproof bowl set over a pan of steaming water and stir occasionally until melted. Do not let the base of the bowl touch the water. Remove the bowl from the heat and set aside until needed.
Put the butter, sugar and vanilla extract in a mixing bowl and use a wooden spoon or hand-held electric mixer to beat until light and fluffy. Gradually beat in the eggs, beating well after each addition. Stir in the melted chocolate, then sift the flour and cocoa directly into the bowl and mix in.
Transfer the mixture to the prepared tin, spread evenly and level the surface. Scatter the chopped white chocolate over the top.
Bake in the preheated oven for about 20 minutes until a skewer inserted in the centre comes out slightly moist but not sticky with uncooked batter. Remove the tin from the oven.
Leave to cool completely in the tin before cutting into 24 pieces. Store in an airtight container and eat within 4 days.
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