First, make some chocolate chip cookies. I just bought the cookie dough and filled the center with peanut butter (that's optional)
Crush 4 or 5 ice cubes
Grab you frozen banana. You can also use ice cream if you don't have or don't like bananas.
I use about 1 bananas worth.
Pick out a cookie!
Break apart and add to blender
Add some milk! About 1/3 cup.
Taste! Add more of whatever you want! Peanut butter, more banana, more milk, another cookie, etc.