Preheat the oven to 350°F (180ºC) and line a baking sheet with parchment paper.
In a large mixing bowl, cream together the butter, sugar, and brown sugar until light and fluffy, about 5 minutes. Add the egg and vanilla extract, stirring until combined, then blend in the peanut butter until smooth.
½ cup unsalted butter, ½ cup sugar, ½ cup brown sugar, 1 egg, 1 teaspoon vanilla extract, ½ cup crunchy peanut butter
In a separate bowl, sift together the flour, baking soda, and salt. Gradually add the dry ingredients to the wet mixture, stirring just until the dough comes together.
1 ½ cups all-purpose flour, 1 teaspoon baking soda, ¼ teaspoon salt
Scoop the dough with an ice cream scoop or tablespoon and place it on the prepared baking sheet. Flatten each dough ball lightly with a fork, creating a crisscross pattern.
Bake for 9 to 11 minutes, or until the edges start to brown. Allow the cookies to cool on the baking sheet for a few minutes, then transfer them to a wire rack to cool completely.
Serve and enjoy your cookies!