Instructions:
1. Preheat oven to 350°F (175°C). Line baking sheets with parchment paper.
2. In a large bowl, cream together peanut butter, butter, and sugar until smooth and fluffy.
3. Add egg and vanilla, mixing until well combined.
4. Whisk together flour, baking soda, and salt in a separate bowl. Gradually mix into the wet ingredients.
5. Scoop dough (about 1 tbsp) and roll into balls. Place on baking sheets spaced 2 inches apart.
6. Flatten each cookie with a fork in a crisscross pattern.
7. Bake for 9–11 minutes or until the edges are lightly golden.
8. Cool on the baking sheet for 5 minutes before transferring to a wire rack.
