Preheat oven to 400 degrees F. Coat baking sheet with vegetable oil
In a bowl, whisk flour, garlic powder, Cajun seasoning, paprika, onion powder, black pepper and salt
Rinse potato wedges under cold water and dredge wedges in seasoned flour. Arrange coated wedges on prepared baking sheet
Bake in preheated oven, flipping over wedges halfway through baking, until coating is browned and potatoes are tender, 35-40 minutes