1. Pre-heat your oven to 180°C. Line a 32cm x 22cm pan with baking paper and set aside.
  2. Melt butter and chocolate in a saucepan over low heat. Set aside chocolate to cool slightly.
  3. Add sugar and vanilla to chocolate and whisk to combine, then add eggs, one at a time, whisking after each addition. Stir through flour, then fold through peanuts. Pour into prepared baking pan and cook until brownie is firm but an inserted skewer comes out with a few crumbs clinging, about 55 minutes. Set aside on a wire rack to cool.
  4. Cut and serve with Island Berries Salted Caramel Sauce.