Preheat the oven to 300°F and line a sheet pan with parchment paper.
In a large microwaveable bowl, melt the butter.
Add the cinnamon, maple syrup, brown sugar, salt, rosemary, and chipotle chile powder to the butter and mix well.
Add the oyster crackers, pretzels, cereal, and pecan halves to the butter mixture.
Toss well to coat and pour the snack mix out onto the prepared pan. Spread it out evenly.
Bake the mix for 15 minutes and remove the pan out of the oven and mix the ingredients well. Place the mix back into the oven and bake for an additional 10 minutes.
Remove the mix from the oven and allow it to cool completely. Break up the mix and add the chocolate candies. Transfer to a serving bowl or to an airtight container for storage.
Nutrition facts are sometimes provided below and are calculated using an online calculator. With specific brands of ingredients and additions, omissions, or substitutions the nutrition facts may change. We encourage you to use your own nutrition facts calculator to obtain the most accurate nutrition facts for your meal.