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My molten peanut butter chocolate mug cake recipe is inspired by Betty Crocker’s Warm Delights, a discontinued dessert I can’t stop thinking about.
Spray a large heatproof mug with cooking spray. To a small bowl, add the milk, oil, and vanilla and whisk to combine. Add the flour, cocoa powder, sugar, baking powder, baking soda, and salt. Whisk to combine, but do not overmix.
Pour half of the batter into the prepared mug. Dollop the peanut butter on top, then add the remaining batter.
Microwave on the standard high setting for 1 minute and 10 seconds or until the batter is just barely set on top. VERY IMPORTANT: Do not overcook, or the cake will turn out tough and dry! If the batter is still wet, microwave in 5-second intervals until it’s done. Remove the mug from the microwave. Add another dollop of peanut butter on top—as much as your heart desires! Allow the cake to cool (and the peanut butter to melt) for 5 minutes, then dive in with a spoon. Love the recipe? Leave us stars and a comment below!