Sift the flour, baking soda, and salt, and set aside.
1¼ cup All-purpose flour, 1 teaspoon Baking Soda, ½ teaspoon Salt
Using the paddle attachment, mix the butter, peanut butter, egg, both sugars, and vanilla extract. Beat them for 5 minutes.
1 Egg, ½ cup Butter, ½ cup + 1 tablespoon Peanut butter, ½ cup Brown sugar, ½ cup Granulated sugar, 1 teaspoon Vanilla extract
Using a rubber spatula fold in the dry ingredients, and gently mix. Do not overmix.
Cover the dough, and chill for at least one hour.
Preheat the oven to 350°F, line two baking sheets with parchment paper and set aside.
In two separate bowls, put the granulated sugar in one and the powdered sugar in the other one.
½ cup Granulated sugar, ½ cup Powdered sugar
Use an ice cream scoop, and make small balls of dough. Roll each ball into the granulated sugar first, and then into the powdered sugar. Use a generous amount of powdered sugar. The more powdered sugar, the more defined cracks.
Bake for 10 to 12 minutes. Midway through the baking time, rotate the baking sheets.
Let the cookies cool down in the trays for 10 minutes, then transfer them to the cooling rack and let them completely cool down.