Melt all ingredients for peanut butter pumpkin syrup in the microwave for about 30 seconds in a microwave safe bowl. (semihealthyblog.com)
Remove from heat and add vanilla to taste if using pumpkin syrup as well. (swankyrecipes.com)
I've seen many other pumpkin syrup recipes that have still very little pumpkin in them (or too much pumpkin so it would be way too thick!) (itdoesnttastelikechicken.com)