Preheat Oven: Preheat your oven to 375°F (190°C). Line a baking sheet with parchment paper.
Cream Wet Ingredients: In a large bowl, cream together butter, peanut butter, sugar, brown sugar, egg, and vanilla until smooth.
Combine Dry Ingredients: Add flour, baking soda, and salt. Mix until a dough forms.
Shape Cookies: Roll the dough into 1-inch balls. Press each with a fork dipped in sugar to create a crisscross pattern.
Bake: Bake for 12–15 minutes, or until lightly golden.
Cool: Let cookies cool on the baking sheet for 5 minutes, then transfer to a wire rack.
