I loved this sweet snack mix as a kid (and an adult) but haven't made it in quite a while. It didn't even occur to me that it could be made MSPI-friendly. Just make sure you use safe chocolate chips, peanut butter and margarine. Here's a recipe from Chex that I like to use. They call it Muddy Buddies, but I've always called it Puppy Chow.
This is a great snack to make with your kids. Libby had a ton of fun shaking the bag!