Place the popped popcorn and mini pretzels in a large mixing bowl.
Add the orange and black candy-coated chocolates, candy corn, and mini marshmallows to the bowl.
Toss the ingredients gently with a large spoon until evenly distributed.
Sprinkle the mini chocolate chips over the top of the mix.
Transfer the snack mix to a serving board and arrange it around a small black bowl to mimic a cauldron shape.