Do-It-Yourself Protein Bars - 2 Cups Peanut Butter. 1 3/4 Cups honey. 2 1/4 Cups Protein Powder. 3 Cups dried oatmeal or granola. In a microwave safe bowl combine peanut butter and honey for 70 -90 seconds. Add protein powder and oatmeal. Mix all of this (it will be thick). Press it into 9X13 inch pan. Put it in the refrigerator to cool.