Step 1

Preheat the oven to 300°F and arrange the oven rack to the lowest position. Line a large baking sheet with parchment paper or aluminum foil.

Step 2

Combine the chex cereal, pretzels, Cheez Itz, oyster crackers in a large bowl and set aside.

Step 3

Melt the butter in a medium saucepan over medium heat. Cook, stirring frequently, for 5-6 minutes until the butter bubbles then foams, and eventually browns. You will start to see the solid bits turn an amber brown color and smell distinctly nutty. Immediately remove from the heat, pour into a small bowl, and stir in the dry ranch seasoning. Alternately, microwave the butter to melt and skip browning (but I recommend it!).

Step 4

Pour the melted butter mixture over the cereal mixture and gently toss to coat, being careful not to break the Chex cereal. Transfer to the prepared baking sheet and spread it into an even layer. Sprinkle the parmesan cheese on top.

Step 5

Bake in the preheated oven for 45 minutes, stirring every 15 minutes. Remove from the heat and allow it to cool to room temperature before serving. Store in an airtight container at room temperature for up to 5 days.