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The Brownie Diaries by Leah Hyslop (Bloomsbury Absolute, £14.99). Photography by Lauren Mclean.
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Put all the ingredients in a large mug, except the chocolate chips. Stir together until you have something resembling a batter, making sure to scrape down the sides of the mug. Stir in the chocolate chips.
Microwave until set on top – this usually takes between one minute and one minute 30 seconds. (Microwaves vary in power, so it’s best to cook this for one minute, check, then blast again in 30-second increments if needed.) Enjoy in pyjamas on the sofa, perhaps with a scoop of ice cream on top.
The Brownie Diaries by Leah Hyslop (Bloomsbury Absolute, £14.99). Photography by Lauren Mclean.