Banana-Fudge Ripple Cake

Ingredients

• firmly packed brown sugar
  ¾ cup
• sugar
  ½ cup
• vegetable oil
  ¼ cup
• mashed ripe banana
  1 cup
• eggs
  2 unit
• all-purpose flour
  3 cup
• baking soda
  1½ tsp
• + 1 tbsp skim milk
  ½ cup
• vanilla extract
  2 tsp
• chocolate-flavored syrup
  ⅓ cup
• unsweetened cocoa
  2 tbsp
• vegetable cooking spray
  1 unit
• sifted powdered sugar
  ½ cup
• skim milk
  1 tbsp
• unsweetened cocoa
  1 tbsp