Add oil, ranch dressing mix, crushed red pepper flakes, garlic powder, onion powder, and black pepper to a bowl and whisk to combine.
Add saltine crackers to the bag dominoes style then pour mixture over crackers
Close and gently turn the bag until all crackers are coated
Preheat oven to 250 degrees. Arrange crackers in single layers on baking sheets. (Do multiple batches if neccesary.)
Let bag sit at room temperature overnight.
