Peanut Butter Miso Dulce de Leche Cookies 9 Steps
In a medium bowl, combine flour, baking soda and baking powder, and whisk until incorporated. Set aside.
In the bowl of an electric mixer fitted with the paddle attachment, mix butter, light brown sugar and granulated sugar at medium speed until light and fluffy, about 5 minutes.
Add miso and peanut butter to the mixing bowl and mix at medium speed until combined, about 1 minute. Scrape down sides of the bowl to make sure all of the ingredients are evenly incorporated, and mix a bit more if needed. Add egg and vanilla extract, and mix until just combined.
Add 1/3 of the flour mixture to the mixing bowl, and mix on low speed until flour mixture is incorporated. Repeat with remaining flour mixture in two batches until all of it is incorporated.
Swirl the dulce de leche into the cookie dough. Fold in using spatula not mixer, without completely mixing in.
Place 1/2 cup turbinado sugar into a small bowl. Working with one piece at a time, scoop out about 2 heaping tablespoons of dough (about 50 grams per cookie), and roll each portion between your hands until it is nice and round. Drop the piece of dough into the bowl filled with turbinado sugar and turn to coat. Transfer each ball to a parchment-lined baking sheet, arranging them about 3 inches apart. Repeat with all of the dough. (If the dough is too soft to roll, you can pop the mixing bowl in the refrigerator for 5 to 10 minutes to firm the dough up slightly.)
Refrigerate for at least 2 hours and up to overnight. If you are running short on time or your cookie dough is not that soft, you can get away with refrigerating for just 15 minutes but the flavour will improve with more time.
When ready to bake, heat oven to 350°F. Bake cookies for about 15 minutes, until crisp at the edges and slightly puffed in the middle. If the first batch of cookies does not spread to your liking, try flattening the cookie dough balls slightly. They should still be a bit underdone in the center. Pull out the baking sheet and hit it against a counter. Place back into the oven to finish for about 3 to 4 minutes. When cookies are firm at the edges and slightly puffed in the center, pull them out and again hit the baking sheet against the counter. The cookies should appear flat and crinkly at the center.
Let the cookies cool on a baking sheet for a few minutes, then transfer to a cooling rack. Store fully cooled cookies in an airtight container. Cookies should still be chewy!