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Frosted Peanut Butter Cake Bars Recipe

  • 150g (⅔ cup) butter, softened
  • 165g (⅔ cup) peanut butter
  • 125g (1 cup) granulated sugar
  • 220g (1 cup) brown sugar, packed
  • 4 eggs
  • 2 tsp vanilla extract
  • 250g (2 cups) plain (all-purpose) flour, sifted
  • 2 tsp baking powder
  • ½ tsp salt
  • 1 pack (approx. 11 oz) milk chocolate chips
  • 113g (½ cup) butter, softened
  • 250g (1 cup) peanut butter, smooth
  • 500g (4 cups) icing (confectioners’) sugar, sifted
  • 80ml (⅓ cup) single cream (half and half)
Frosted Peanut Butter Cake Bars Recipe


  1. Preheat the oven to 180°C, 350°F, gas mark 4, and grease a 13×9 inch baking pan.
  2. To make the cake bars, cream the butter, peanut butter, vanilla, and both sugars until fluffy. Add the eggs, one at a time, beating well after each addition. Add the flour, baking powder, salt and mix until just combined. Fold in the chocolate chips.
  3. Spread evenly into the baking pan and bake for 45-50 minutes, or until a toothpick inserted comes out clean. Allow to cool completely in the baking pan.
  4. To make the frosting, beat butter and peanut butter until light and fluffy. Then slowly beat in ½ of the icing sugar, add the cream or half and half then beat in the remaining icing sugar. If necessary, add a little more cream to reach speeding consistency.
  5. Spread the buttercream frosting evenly over the cooled bars and allow to set before cutting into bars.

Frosted Peanut Butter Cake Bars Recipe Frosted Peanut Butter Cake Bars Recipe Reviewed by kuji hara on 2:37 AM Rating: 5

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