I’d not known about a pb flavor, but have used Quaker Oats exclusively for cookies, waffles, meatballs and meatloaf, and packets of cinnamon swirl flavor for dd for pretty much her lifetime. I’m sure I called st some point in her life, but not recently enough to be relevant here. So, probably not very helpful. The plain oats in the round box were my binder in meatloaf and meatballs when we could not use eggs.