What's that called again?

A couple of people at my husband's work really enjoyed a batch of butterscotch-oatmeal cookies he took with him recently. When trying to recall the magic ingredient, he just couldn't come up with the word.

"What was it called again?? Butter? Butter-something. Buttercrotch? No, that can't be it."

No, honey. That's certainly not it.

"Here you go, lovely co-workers. Have a chomp on some lovely buttercrotch, why don't you?"

Needless to say, he knows the correct name for the magic ingredient now. Buttercrotch is not it.