This was one of the first questions I got as asked as soon as I posted this recipe. There isn't cookie butter in the cupcake recipe for two reasons. One, there's a quite a lot of cookie butter in this recipe as it is. I found that adding cookie butter to the cupcake recipe made the assembled cupcake a bit too heavy and too sweet. Two, using cookie butter in the cupcake recipe would require not one but two jars of cookie butter, which can be pretty pricy.