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You will need a rectangular or square shaped brownie or baking tin for this. Start with preparing the peanut butter layer.
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First whisk the sugar and butter together to form a creamy mixture.
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Stir in the peanut butter and then the biscuits.
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Spread the mixture to the bottom of the baking tin and try to make it an even layer as much as possible.
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Next, melt the chocolate in a bowl, that is sitting on a saucepan of simmering water.
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Add in the butter and vanilla sugar and stir until the mixture is smooth. Last step is to spread the chocolate mixture on top of the peanut butter layer.
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Put the tin in the fridge until the chocolate is set.
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I made this the night before and it was perfect the next day.
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Don't forget to take it out of the fridge about 15 minutes before you serve. Slice it with a sharp knife and enjoy your peanut butter bars.