Preheat oven to 300°F. Line a large baking sheet with parchment.
Melt the butter in a small saucepan or microwave until just melted.
Whisk ranch mix, garlic powder, dill, onion powder, and red pepper into the warm butter.
Place crackers in a large bowl. Drizzle with the seasoned butter and gently toss to coat.
Spread crackers on the sheet in a single layer.
Bake 12–15 minutes, stirring once halfway, until fragrant and crisp at the edges.
Cool completely on the pan. Sprinkle parsley, if using, then serve or store airtight.