In a large microwaveable bowl add the rice chex cereal, pretzels and peanuts. 

Cut the butter into tablespoon sized pieces and add it to another microwaveable bowl along with the brown sugar, vanilla and salt. Heat for a minute or two at 50% power until the butter has completely melted. Stir to combine. 

Pour the brown sugar mixture over the cereal, peanuts and pretzels. Stir gently to make sure all of the pieces are coated.  

Microwave uncovered on High 4 to 5 minutes, thoroughly stirring about every 2 minutes. Spread the hot cereal mixture on a parchment-lined cookie sheet pan to cool.

Once it has completely cooled (about 5 minutes) add the caramel bits and apple chips to the mixture and serve.