At one time to get muscle mass, I would put pretty much anything in a blender and drink it. You think peanut butter is tough, try almond butter!

The secret is to blend everything but the peanut butter until it's relatively smooth. Cut the engine to low and add the peanut butter while it's still whipping around. Put the lid back on and put the spurs to it... it should blend.

My dad used to make milkshakes with chocolate ice cream, milk, peanut butter... and get this... wheaties cereal. Although with my serious milk and gluten problems, I dare not try it these days, back then it was ambrosia.