Melt butter and mix in the packet of Hidden Valley Ranch Seasoning Mix.
Pour butter mixture over the oyster crackers and stir thoroughly.
Spread oyster crackers in single layer in large baking pan.
Bake the oyster crackers for 20 minutes, remove from the oven and stir and then bake for another 20 minutes. Remove the oyster crackers from the oven and cool to room temperature.