Peanut Butter Cookie in a Mug
Ingredients
Directions
Place butter and peanut butter in a microwave-safe mug. Microwave until butter and peanut butter are melted, about 30 seconds. Stir brown sugar, white sugar, and salt into butter mixture. Add egg; stir flour into mixture.
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Cook in the microwave until cookie is set, 2 to 4 minutes.
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