Spray a square non-stick baking pan (8 inch x 8 inch) with non-stick cooking spray.
Combine the ingredients in a large mixing bowl, blend well. Pour batter into pan and bake 20-30 minutes until cooked. To test if batter is cooked, insert a toothpick. If it comes out clean, brownie is cooked.
Remove from oven and let cool for five minutes in pan.
Gently remove from pan; place on wire rack and when cool, sprinkle with icing sugar if desired. Cut into eight squares. Enjoy!