Preheat the oven to 355F (180C) and line two baking sheets with parchment paper.
In a bowl, whisk together the flour, baking soda, and baking powder. Set aside.
In a large mixing bowl, beat the butter, granulated sugar, brown sugar, and vanilla extract together with a hand mixer on medium speed until a paste-like consistency.
Add the miso paste and beat until fully incorporated. Then add the egg and beat again until well combined.
Add the dry ingredients and mix on low until just combined.
Fold in the chocolate chips with a rubber spatula.
Scoop the dough into 16 balls (I use a 3 tablespoon cookie scoop for that) and place them on the prepared baking sheets, leaving enough space between each one for spreading.
Bake for 10-12 minutes or until the edges are set and lightly golden but the centers still look slightly underdone. They will firm up as they cool.
Remove from the oven and allow to cool on the baking sheet for 5 minutes before transferring to a wire rack.