Slice each potato length into 14-inch ovals then slice each oval lengthwise into matchsticks
Coat a baking sheet with 3 sprays of vegetable oil
Combine egg whites and Cajun spice in a bowl
Add the matchstick potatoes and mix to coat
Pour the coated potatoes onto the prepared baking sheet and spread them out into single layer leaving a little space between Place the baking sheet on the bottom shelf of the oven
Bake for 40 to 45 minutes until the fries are crispy turning them every 6 to 8 minutes with a spatula so that they brown evenly