Whatever will fit in the bowl.
I'm going to eat a bowl of Cheerios, shall I add 1 cup of milk or 1 1/2 cups of milk?
Whatever amount that suits you, but in a RED bowl! :)
This will require additional planning---What is the capacity of the bowl?
Only use a half a cup as they're better crunchy !
Use less than a cup, and don't forget to add the banana.