One of my favorite treats when I was growing up was classic Rice Krispies treats developed by Kellogg. (Recipe for classic treat at Kellogg) I’m sure you have all made them at some point. Rice Krispies cereal, butter, and marshmallows are the 3 basic ingredients. I like the small marshmallows as they melt faster. You can use stick margarine but tub margarine is not recommended. It was a favorite recipe for me as a young cook all the way through my early 20’s. I rarely eat them now as I limit my sweets, but an occasional treat can be good.