The recipe calls for:
1 cup coffee
1 cup fat-free vanilla greek yogurt
1 tbs flax & chia seed blend
4 tbs natural peanut butter
1 frozen banana
-- Blend all the ingredients together and ENJOY! This recipe is two servings.
I used natural chunky peanut butter because it's all I had. If you only have regular greek yogurt just add a little vanilla extract for flavor. Also, if you don't want to use coffee, you can add ice or fat-free milk instead.
UPDATE: I kept half of this for the next morning and it was a little thick I guess from sitting overnight. So I just added a little milk and shaked my smoothie cup.