We love this smoothie. Thursdays are banana days at a lot of stores, so we always stock up on bananas for a low price. (Check at your store - even if there isn't an advertised sale, ask a teller and they might give you a discount.) Our favorite way to use them is like this:
1/2 c. plain, low-fat yogurt
1/2 T. PB
1/2 c. milk
1 med. banana, broken into 1-2in. pieces
dash vanilla extract.
Put all into Magic Bullet or blender, blend, enjoy! (Serves one. If counting points, this is 5pts. and is pretty filling/satisfying.)
Note - I found this recipe years ago, I think through the Discovery Channel's weight loss challenge. I first started using vanilla yogurt - that's a great substitute for the plain yogurt, if you're interested. Also, the original recipe called for frozen bananas, if you'd like to go that route.