Preheat oven to 350 or 375 depending type of cookie you want to bake. (refer to post above regarding this)
Brown butter.
Beat brown butter, brown sugar, and white sugar together.
Add egg, peanut butter, and vanilla extract and beat until thoroughly incorporated.
In a separate bowl, mix together the flour, baking soda, baking powder, and salt.
Add the dry ingredients into the wet and mix until just incorporated.
Chill the dough for at least 30 minutes.
Create either a dozen and half or two dozen cookies and bake on a parchment lined baking sheet for either 10 - 12 or 12 - 15 minutes.