Step 1

Preheat the oven to 350°F. Line an 8 by 8-inch baking pan with parchment paper.

Step 2

In a medium bowl, add mochiko, cocoa powder, sugar and baking powder. Whisk together until evenly mixed.

Step 3

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.

Step 4

Pour batter into prepared baking pan. Sprinkle surface with chopped chocolate.

Step 5

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.