Peanut Butter Flavoring Recommendations

Anyone have any suggestions for peanut butter flavoring? I have pretty much every sugar free Torani flavoring you can think of. I dabble with skinny syrups and other brands (love the Girl Scout line I’ve found recently from another brand). I have been unable to find a good zero calorie replacement for peanut butter flavoring. Peanut butter is one of my weaknesses and something I crave, but even things like PB2 are not enough to scratch the itch due to calories for me. Thanks in advance!