Preheat your oven to 300°F (150°C).

In a large bowl, combine pretzels, cheese crackers, mixed nuts, mini marshmallows, M&Ms, and chocolate chips.

Melt the butter in a bowl using microwave (in 30-second intervals) or on the stovetop. Stir in brown sugar and vanilla extract until well combined.

Pour the melted butter mixture over the dry ingredients and gently toss until every piece is evenly coated.

Spread the coated snack mix in a single layer on a large baking sheet. Optionally sprinkle with popcorn salt.

Bake for 10-15 minutes, stirring halfway through to prevent burning. Keep a close eye as ovens vary.

Remove from oven and let cool completely on the baking sheet. The mix will harden and become crunchy.

Break into pieces once cooled and store in an airtight container at room temperature. Enjoy!