Total time: 35 minutes
Yields: 8 servings
Preheat oven to 350°. Lightly grease the bottom and sides of a 10-inch cast-iron skillet.
Stir flour, baking powder, and salt into the miso mixture until fully combined. Spread the batter in an even layer in the prepared pan, the smoothing surface with a rubber spatula. Sprinkle the surface with black and white sesame seeds to cover completely.
Bake at 350° for 20 to 25 minutes or until a toothpick inserted into the center of the blondie comes out clean. Cool completely; cut into wedges and serve.