I plugged the chocolate Peanut Butter Muffins recipe into MyFitnessPal. I subbed 3 packets Stevia for the erythritol, I came up with 9.8 net carbs (20.5 carbs-10.7 fiber) for 2 muffins. Where would sugar alcohol come from? When I look at the recipe on the app, where do I look for the sugar alcohols?