Preheat oven to 180°C.

Spray a square nonstick baking pan (20.5cm x 20.5cm) with nonstick 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.