Browned Butter Peanut Butter Cookies are perfectly soft and chewy, loaded with nutty flavor from peanut butter and luscious browned butter, and topped with a sprinkle of sea salt. They're quite possibly the best peanut butter cookies ever.
Make browned butter. Cut the butter into cubes and place it in a medium, light-bottomed saucepan over medium heat. Cook and stir while it becomes foamy and bubbly. After 5-8 minutes, it will begin to toast and you'll see little brown flecks. Immediately pour the butter into a heat-proof bowl to stop the cooking process. Measure the browned butter to make sure you have ½ cup. Cool to room temperature.
Beat ½ cup browned butter and both sugars on medium speed until combined. Mix in the egg for one minute. Add the peanut butter and vanilla and mix for one minute. Mix in the flour, baking soda, and salt until just combined. Do not over-mix. Chill the dough for 1-2 hours, up to overnight.
Preheat the oven to 350 degrees. Prepare cookie sheets with parchment paper or silicone baking mats. Let the dough sit at room temperature for 5-10 minutes so it's easy to work with.
Scoop 2-tablespoon dough balls and set them onto a baking sheet. Use your hand or a greased silicone spatula to gently press the cookie dough balls into ¾ inch thick pucks. Sprinkle flaky sea salt on top.
Bake for 9-11 minutes or until the edges are set and the tops are very light brown. The centers will still be very soft. Be careful not to overbake or the cookies will be dry.
Cool cookies on the baking sheet for 5 minutes, then transfer them to a wire rack to cool the rest of the way. Store cooled cookies at room temperature in an airtight container for up to one week.
Notes
When making browned butter, some of the liquid will evaporate. Start with 9 tablespoons of butter so you can end up with 8 tablespoons of browned butter. Don't walk away from the stove when making browned butter -- it can go from toasted and lovely to burned and bitter in no time. For the richest flavor and softest texture, chill the dough for 1-2 hours.