Makes 12
adjust servings:

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For the filling:

  1. Preheat the oven to 150˚C/130˚C fan/gas mark 2. Butter a 20cm square baking tin and line with parchment paper.
  2. Melt the butter and chocolate in a bowl set over a saucepan of simmering water. Remove from the heat and stir until smooth.
  3. Whisk together the flour and baking powder in a separate bowl.
  4. Whisk the sugar into the chocolate mixture, then gradually whisk in the eggs until smooth.
  5. Stir in the vanilla, then stir in the flour until incorporated.
  6. Stir together all of the filling ingredients in a separate bowl.
  7. Spread the batter into the pan. Add dollops of the peanut butter filling all over, then use a knife to swirl it through.
  8. Bake for 40-45 minutes until a skewer inserted into the centre comes out clean. Leave to cool before slicing.

Nutrition Facts

Per serving: 364kcals, 22.6g fat (10.1g saturated), 36.6g carbs, 29.1g sugars, 7g protein, 2.1g fibre, 0.212g sodium

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