Here’s a tip for making smoothies with peanut butter: first, blend all the ingredients without the peanut butter, then add the peanut butter to the center of the smoothie and continue blending. This will keep the peanut butter from sticking to the sides of the blender, making it easier to clean. Don’t forget to give the blender a quick rinse right after using so the smoothie doesn’t dry and stick on the inside (a more thorough cleaning can be done later, if desired).