Preheat oven to 400 degrees.Put olive oil and spices in small bowl and mix well.Slice sweet potatoes and put on large baking sheet (or two if you are making a lot).Pour oil over the fries and toss by hand until evenly coated- this will also coat the baking sheet.Bake for 25-30 minutes or more until slightly browned and tender.Serve with homemade ketchup or mayo (It is a French thing!).