Preheat your oven to 350 degrees Fahrenheit.
Soften your unsalted butter in the microwave for about 20 seconds.
In a mixing bowl, add the softened butter, creamy peanut butter, brown sugar, and white granulated sugar. Mix well until smooth and creamy.
Crack in an egg and pour in the pure vanilla extract. Stir until well combined.
Gradually stir in unbleached flour, baking soda, and baking powder.
Scoop out dough using about two tablespoons per cookie and shape them into balls.
Using a fork, gently press down on each cookie ball to create crosshatch patterns on top.
Sprinkle sea salt on top if desired and bake for about nine minutes until slightly under-baked.
Let your cookies cool on the baking sheet for about fifteen minutes before transferring them to a cooling rack.