Preheat oven to 350 F. Prepare an 8-inch by 8-inch baking dish with parchment paper.
Blend all ingredients except chocolate in a food processor or blender. Scrape down the sides and blend until smooth.
Transfer the batter to the prepared baking dish and smooth into an even layer. The batter will be sticky. Wetting a spatula with a small amount of water can help with this. Add the chocolate chips on top.
Bake for 30 minutes then remove from the oven and cool at room temperature at least 1 hour before slicing into bars.
Store the bars in the refrigerator up to 2 weeks or in the freezer up to 90 days. My low calorie cookbook has another protein bar recipe and other protein snack options.
Notes
Choose a protein powder without unnecessary ingredients that is low in added sugar or uses stevia or monkfruit. The ideal protein powder has less than 7 grams of fat, 20-30 grams of protein, and has less than 15 grams of carbs per serving. Also avoid whey protein for this recipe.
The protein bars must cool for at least an hour to ensure they hold their shape and aren’t overly sticky when you slice into them.
Warm your peanut butter so that it’s easy to pour and blend into the batter.