Banana chocolate milkshake

Ingredients:
1cup skim milk
2 tbsp cocoa
1/3 cup sugar
1 tsp vanilla extract
1 medium ripe banana, sliced
8 large ice cubes
 
Method:
1.In blender container pour milk. Add cocoa. Cover, blend on low speed until well mixed. Add sugar, vanilla and banana. Cover, blend until smooth.
2.Add ice cubes, one at a time, blending until thick