The official energy bar of Ironman triathlon, Bonk Breaker just added this third flavor – peanut butter chocolate chip – to its High Protein line. This small, dense, 270-calorie bar is a protein bomb at 13 grams, so it's best devoured for quick, convenient fuel or to recover after a long ride or run. Bonk Breaker uses brown rice protein and peanuts instead of dairy-derived proteins, so it's easier on the stomach than many comparable bars.