Preheat oven to 350 degrees F (175 degrees C).
Mix peanut butter, sugar, and egg together in a bowl using an electric mixer until smooth and creamy. Roll mixture into small balls and arrange on a baking sheet; flatten each with a fork, making a criss-cross pattern.
Bake in the preheated oven for 10 minutes. Cool cookies on the baking sheet for 2 minutes before moving to a plate.
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