"Every day can feel like your birthday since this simple and festive mug cake can be ready in minutes. Unlike other mug cakes, this one is super tender, avoiding the spongy texture that is all too common...."
INGREDIENTS
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2 tablespoons butter, softened
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3 tablespoons sugar
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1 egg yolk
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2 tablespoons milk
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1 teaspoon vanilla extract
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5 tablespoons self-rising flour
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Pinch of salt
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1/2 tablespoon rainbow or confetti sprinkles
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Frosting: (optional)
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1 1/2 tablespoons butter, softened
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1/4 cup powdered sugar
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1/8 teaspoon vanilla
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Milk or water to achieve desired consistency