Peel two bananas and cut into slices. Place on a plate and put in freezer. Freeze for at least 4 hours, or longer if possible. 

When ready to make the shake, add graham crackers to the blender and pulse until broken into crumbs. 

Next, place frozen bananas slices into blender. Add milk and Greek yogurt, and blend. 

Finally, add natural peanut butter and low-fat cream cheese, and blend until smooth. 

Transfer to serving glass and enjoy!