Mix and eat! I honestly have no idea about about proportions of the ingredients, I never measure haha. You do generally want to have more cereal than the other ingredients. Mix to your heart's content, enjoy, and give it as a small gift!
Notes
* If you can't find peanut butter chips, you can use holiday peanut butter m'n'm candies instead! **For purposes of buying ingredients, I would buy 1 box each of both cereals (or just one box if you're going GF with only the honey nut chex), and one package/container of each of the rest of the ingredients. Mix to your desired proportions - or, just dump everything and go!
Recipe by Dana Monsees Nutrition at https://www.realfoodwithdana.com/christmas-crunch-gluten-free/