Line 2 rimmed baking sheets with foil for easy cleanup. In a small bowl, whisk together melted butter, Ranch dressing mix, lemon pepper, dill weed, and garlic powder.
To a very large bowl, add oyster crackers. Drizzle with the melted butter mixture and toss until evenly coated. Spread evenly over prepared baking sheets.
Air-dry at room temperature for 3 to 4 hours, stirring periodically to help crackers dry evenly.
