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To make the mug cake mix, add all the ingredients to a bowl and mix to combine.
Transfer to a jar and cover with a lid.
To make the mug cake, in a microwave-safe mug place 4 tablespoons of mixture, 1 tablespoons of melted butter, 1 egg yolk and 1 teaspoon of vanilla extract and whisk to combine.
Microwave on high for 50-60 seconds or until just firm to touch and toothpick inserted into the center comes out clean.