melt almond bark over LOW heat in a double boiler stirring frequently.
I suggest mixing a handful of all ingredients EXCEPT powdered sugar to see if you like more pretzels or more chex or whatever.
I just fold in the cereals, pretzels, & pecans into melted bark until well coated. I didn't measure any of it, I just kept adding more until all pieces were covered well with bark, but there wasn't a ton of extra bark at the bottom of the pan.
Spoon mixture onto waxed paper or foil in large bite-size clumps. (I use wax paper on a cookie sheet for easier transfer to the fridge.) Move into the fridge for fast cooling if you like. When bark has set, put all the pieces in a large tupperware type container or large ziploc bag. Sprinkle the powdered sugar all over, then shake the container to spread it around well.