In a large bowl, combine the flour, baking soda, baking powder, and salt. Set aside.
Cookies may appear underdone in the middle, but they will become more firm as they cool. It's important to allow them to cool a few minutes before removing them from cookie sheet.
You may require less or more baking time depending on the size of your cookie.
If you are using all-natural peanut butter, try adding in another 1/2 tablespoon of flour, as cookies tend to spread too thin when baking with all-natural peanut butter.