I've never done this which is why I'm curious to the recipes as well. In college I used to mix rice crispies, peanuts, chocolate and marshmallows. Once you mix them completely put it in a microwave for a few minutes, mix it again let it cool and shape them in the appropriate sizes using a pan. A few hours in the refrigerator and you've made your own breakfast bars! I just invented it but I realized it could be a thing since I know some granola snacks are made this way but with honey, butterscotch, sugar etc.