Preheat oven to 250°F.
In a large bowl, mix together Crispix, Cheerios, oyster crackers, pretzels and pecans.
In a medium, microwave safe bowl, melt butter in the microwave. Then, with butter still hot, whisk in brown sugar, vanilla and salt.
Pour butter mixture over cereal mix and stir until cereal mix is evenly coated.
Transfer mix onto a parchment lined baking sheet and and bake for 1 hour, stirring every 15 minutes.
Let snack mix cool completely before stirring in candy coated chocolates.