- 1 tablespoon butter
- 1 tablespoon peanut butter
- 1 tablespoon brown sugar
- 1 tablespoon white sugar
- 1 pinch salt
- 1 egg
- 3 tablespoons all-purpose flour
- 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.
- Cook in the microwave until cookie is set, 2 to 4 minutes.