Be prepared, if you are going to make this mix. It is quite addictive! We have used several different cereal mixes, including all Chex cereals, and Life cereal. We also love to use pretzel spinzel sticks, as a different version, but really any hard pretzels can be used. Enjoy!
Spray rimmed baking sheet with non-stick cooking spray. Mix cereals, nuts, and broken pretzels together on sheet. Set aside.
Place butter and brown sugar in a medium-sized, heavy saucepan. Heat on medium high until mixture begins boiling, stirring constantly. Reduce heat to low and continue boiling for 3 minutes, while continuing to stir.
Carefully pour hot caramel mixture onto cereal mix, trying to coat each piece. Stir by turning over with a spatula.
Bake mixture for 8 minutes. Remove and stir.
Return to oven, bake an additional 5 minutes, and remove from oven. Stir mixture one last time and allow to cool completely.
Break up any large pieces and store in a covered, plastic container.