Preheat oven to 300 degrees F.
Combine oil, melted butter and spices together in a large bowl. Add oyster crackers and stir gently to coat the crackers. Pour crackers out on a large, parchment-lined sheet pan. (Trust me on the parchment paper, it makes clean-up a breeze!)
Bake for 25 minutes, stirring gently after 15 minutes.
Let cool. Store in an airtight container.