Peanut Butter–Marshmallow Kix trees

I was instantly smitten with the Kix Cone Trees in Betty Crocker’s Good and Easy Cookbook (1957), as they are basically a cone-shaped marshmallow Rice Krispy Treat but with Kix, a round cereal made with corn. I discovered another similar sweet in a coconut booklet, and an actual marshmallow cereal treat in Fun with Food by Lynne White (1957). For my version, I browned the butter (super easy to do in the microwav