01 - Heat oven to 350°F (175°C). Line a large baking sheet with parchment paper.
02 - In a large mixing bowl, blend pecans, almonds, cashews, and pretzels until evenly mixed.
03 - In a separate small bowl, whisk together melted butter, brown sugar, cinnamon, cayenne pepper, and kosher salt until a smooth paste forms.
04 - Pour seasoning blend over nut mixture. Toss thoroughly to ensure each piece is evenly coated.
05 - Spread coated mixture onto prepared baking sheet in a single layer. Bake for 15 minutes, stirring halfway through, until nuts are fragrant and slightly golden.
06 - Remove from the oven and allow mix to cool completely on the baking sheet before serving or storing.