PB2 is a super low-calorie powdered peanut butter that I first heard about from Our Best Bites. This powdered substitute is only 45 calories for 2 Tbsp., compared with a whopping 180 for 2 Tbsp. of normal peanut butter! While I probably wouldn't use it to replace the real stuff in every recipe, it's great for adding a little peanutty flavor to sauces and smoothies that you want to keep low-cal.
(Image via The Oregon Tale.)
Our local grocery store carries normal PB2 as well as a peanut butter & chocolate version in their health food section. The bottle was a little pricey at $4.50, but with 30 Tbsp. inside, it's going to last a while! I've already used it a few times with great results for our 5:2 diet recipes and will share one of those next.