This sounds similar, if not exactly, what you're looking for, Angie. Perhaps you can adapt it by omitting the bacon and subbing the honey with Karo. It should give you a general idea about proportions.

PEANUT BUTTER SPREAD
2 c. creamy peanut butter
1 lg. jar marshmallow cream
1 c. honey
1/2 to 1 lb. bacon, fried crisp*

Fry bacon very crisp. Place between paper towels and roll with rolling pin until most of the grease is out and the bacon is finely crumbled.* Set aside. Blend peanut butter, marshmallow cream and honey together until well mixed. Add the bacon bits and put in a tightly sealed jar. This does not have to be refrigerated.
[*If I were to make this, I'd simply use a 3-ounce container of commercially prepared real bacon bits. It gives the equivalent of a 12-16 ounces of bacon without the fat.)