Step 1

Cream the butter and miso in with a stand mixer or in a large bowl with electric beaters. Add both the sugars and continue to beat until light and fluffy, about 2 minutes. Add the egg and vanilla and beat for 1 minute more.

Step 2

Add the flour and baking soda to the bowl and stir just until they're mixed. Fold in the chocolate chunks.

Step 3

Cover the bowl and put it into your fridge to chill for 1 hour. (This helps the flavor develop and prevents the cookies from spreading too much.)

Step 4

Preheat your oven to 350 degrees Fahrenheit.

Step 5

Scoop the batter with a medium-sized cookie scoop onto cookie sheets and gently press the tops down with your fingers. Bake for 12-14 minutes, or until golden on the bottom. Transfer the cookies to a wire rack to cool.