Preheat oven to 350 degrees F. Line two baking sheets with parchment paper
In a medium bowl, whisk together flour, baking powder, baking soda, and salt.
In another bowl, mix together butter, sugar, and brown sugar until well combined. Mix in peanut butter and blend in egg an vanilla. Add the flour mixture and mix until just combined
Scoop dough out and shape into 1 1/2 inch balls. Place two inches apart on baking sheets. Using a fork, slightly press the fork into the top of the ball and then the opposite way doing the same.
Bake cookies, one sheet at a time for about 9-10 minutes. Let cool on a baking sheet for 5 minutes and then transfer to a wire rack to cool completely.
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