Preheat electric oven to 350°F.
Grease a 13 x 9 x 2-inch pan or two 8 x 8 x 2-inch pans.
In a large bowl, combine mochiko, sugar, and baking powder.
Add remaining ingredients and mix well with a wire whisk.
Pour into prepared pan(s) and bake for 50 to 60 minutes then let cool.
