In a small bowl, whisk together the dry ingredients.
In a separate bowl, cream together the butter, sugar, and brown sugar.
Add the peanut butter to the butter and sugar bowl and mix to combine. Once the peanut butter is mixed, add the egg and vanilla to combine.
Then add the bowl of dry ingredients to the bowl of the wet and mix just until combined and no dry ingredients remain visible.
Scoop the cookie dough into about 1 tablespoon sized balls, and place them spread out on a baking sheet.
Take a fork and gently press down into the cookie dough ball, creating a criss-cross pattern on top of the cookies.
Bake the peanut butter cookies for 8-10 minutes, depending on your oven. You want them to just barely be set in the middle when they are done.
Allow the cookies to rest on the baking sheet for 10 minutes before carefully transferring them to a cooling rack to finish cooling.
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