Step 1

In a medium bowl, mix together the flour, baking soda, baking powder and salt. Set aside.

Step 2

Beat the butter with an electric mixer until light and fluffy.

Step 3

Beat in the brown sugar and white sugar well.

Step 4

Lower mixer speed and beat in the peanut butter and the egg.

Step 5

Mix in the dry ingredients until just combined.

Step 6

Wrap the dough in plastic wrap and chill for at least 3 hours.

Step 7

Preheat oven to 375 degrees F.

Step 8

Use clean hands to shape the dough into 24 small balls. Place about 2 inches apart on a parchment-lined baking sheet.

Step 9

Flatten the cookies with a fork, pressing a crisscross pattern onto the surface.

Step 10

Bake for about 10 minutes or until light brown.

Step 11

Remove from oven and let cool for 1 minute before transferring to a wire rack to cool completely.