In a medium bowl whisk together the flour, baking powder, and baking soda. Set aside.
1 ½ cup all purpose flour, ½ teaspoon baking powder, ½ teaspoon baking soda
In the bowl of a stand mixer fitted with the paddle attachment, beat together the butter, peanut butter, brown sugar and granulated sugar on medium speed for 4-5 minutes, until light and fluffy. Stop the mixer and scrape down the bottom and sides of the bowl.
½ cup unsalted butter, room temperature, ½ cup creamy peanut butter, ⅔ cup light brown sugar, packed, ¼ cup granulated sugar
Beat in the miso paste, vanilla and egg for another 2 minutes on medium speed. Stop the mixer and scrape down the sides of the bowl and paddle.
2 tablespoons white miso paste, 1 ½ teaspoons vanilla extract, 1 large egg, room temperature
On low speed, add the flour mixture and mix just until combined, about 15-30 seconds.
Cover the bowl with plastic wrap and chill for at least 30 minutes.
Preheat the oven to 350F. Line two cookie sheets with parchment paper.
Using a cookie scoop, scoop and portion the cookie dough. Roll each scoop into a ball.
Roll the dough ball in the sugar to coat. Place the dough balls on the prepared baking sheet, 2" apart.
⅓ cup granulated sugar
Bake for 10-11 minutes. The edges and the top should be just set, and no longer wet. Sprinkle with sesame seeds if using.
Let the cookies cool on the cookie sheet. The cookies should puff up a bit in the oven and deflate as they cool. Serve warm or room temperature.
1 tablespoon black sesame seeds (optional)