Preheat the oven to 250°F and line a baking sheet with parchment paper.
Add the oyster crackers to a large bowl.
In a small bowl, whisk together the oil, ranch seasoning, dill, garlic powder, and onion powder.
Pour the mixture over the crackers and toss until evenly coated.
Spread the crackers in an even layer on the prepared baking sheet.
Bake for 15 to 20 minutes, stirring halfway through.
Let cool completely before serving. The crackers will continue to crisp as they cool.