Preheat the oven to 350°F. Line an 8 by 8-inch baking pan with parchment paper.
In a medium bowl, add mochiko, cocoa powder, sugar and baking powder. Whisk together until evenly mixed.
In a large bowl, add melted butter, eggs, milk, and vanilla extract. Whisk until evenly combined and no egg streaks remain. Add in dry ingredients. Mix until evenly blended.
Pour batter into prepared baking pan. Sprinkle surface with chopped chocolate.
Bake 60-70 minutes or until mochi is set. A toothpick inserted should come out mostly clean. Let mochi cool completely before slicing and serving.
Notes
You can replace whole milk with other milk substitutes. Keep in mind that different milks may make the brownies more or less rich.
You can use natural or dutch proces cocoa powder. I used dutch process.
Make sure to let the mochi cool before cutting. When it is still hot, it will be very sticky and difficult to slice.
Uneaten mochi can be stored in a sealed container at room temperature up to 2-3 days.
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The nutrition information provided are only estimates based on an online nutritional calculator. This is not a comprehensive list of all the nutrients in the recipe (i.e., does not include vitamins, cholesterol, etc). I am not a certified nutritionist. Please consult a nutritionist or doctor for accurate information and any dietary restrictions and concerns you may have.