If you combine a lot of excellent things (peanut butter, cookie dough, brown butter, and roasted salted nuts), it stands to reason that the end result will be impressively delicious. This cookie recipe, adapted loosely from the recipe from the back of the Jif jar for classic PB cookies, proves the point. —Posie (Harwood) Brien
While the oven preheats, toast the peanuts on a baking sheet until just beginning to brown (about 10 minutes). Let the nuts cool, then roughly chop them.
Melt the butter in a saucepan over medium heat, swirling the pan constantly, until it begins to brown and smell nutty. Allow the butter to cool before proceeding with the recipe.
Once the brown butter is cool (or not hot at least if you are impatient!), beat the butter, brown sugar, and vanilla together. Add the egg and beat well.
Whisk together the flour, baking powder, baking soda, and salt. Add to the dry ingredients and mix well.
Add the peanut butter and beat until combined. Stir in the chopped, toasted nuts.
Drop the batter in heaping spoonfuls on a parchment-lined baking sheet. Using the back of a fork, press gently down in a cross-hatch pattern on top of each cookie and flatten the cookie to about 1/2" thick. If you want, sprinkle with flaky sea salt and raw sugar. Bake until golden, between 8-12 minutes depending on the size of your cookie (don't overbake!).