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In a large bowl, mix together all of the ingredients minus the peanut butter.
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In 6 microwavable mugs (roughly 1 cup measurement each), scoop in your peanut butter and then pour your cake mix on top.
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Divide the mix evenly between 6 mugs.
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If you don’t want to cook them off straight away then place them in the refrigerator for up to 24 hours.
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Microwave 1 at a time for 45-60 seconds. (Timing is based on my 1200W microwave so your timing might vary). Cook one at a time so they each cook evenly.
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Let the cake stand for 5 minutes before eating. Mix together whipped cream and peanut butter then pipe it on top of your mug cake. Finish by sprinkling over chopped toasted peanuts. Serve warm.