Preheat your oven to 180°C (350°F) and line a baking sheet with parchment paper.
In a mixing bowl, combine the creamy peanut butter, granulated sugar, and egg. Stir vigorously with a spatula until the mixture is smooth, glossy, and well blended—about 2 minutes. The dough should feel thick but spreadable.
Using a tablespoon or cookie scoop, portion out the dough and roll each into a ball. Place them evenly spaced on the prepared baking sheet, about 2 inches apart.
Chill the baking sheet in the refrigerator for 10 minutes if the dough feels too soft—this helps prevent spreading during baking.
Use a fork to gently press down each dough ball, creating a crisscross pattern. Apply firm but gentle pressure; you should hear a slight crackle as you flatten the cookies.
Bake in the preheated oven for 10-12 minutes, until the edges are golden brown and the cookies look set but still slightly soft in the center.
Remove the baking sheet from the oven and let the cookies rest for 5 minutes on the sheet—this allows them to firm up slightly.
Transfer the cookies to a wire rack and cool completely for about 15 minutes. Once cooled, they will have a crispy exterior with a chewy, gooey interior.
Enjoy your peanut butter cookies with a glass of milk or as they are—rich, rustic, and utterly satisfying.