Place cooking oil in a deep, heavy bottomed pot over medium high heat and bring up to 325°F.
Preheat your oven to 200°F and place a baking sheet on the middle rack.
Wash and cut your potatoes into 1 inch sticks. Prep a plate or second baking sheet with a cooling rack set on top, near your oil pan.
When oil is up to temperature, carefully drop in half the french fries. Gently stir and allow to fry for 2 to 3 minutes.*
Remove from oil with a spider strainer or tongs and lay them on the cooling rack set over the baking sheet in a single layer.
Cook the second batch of fries when oil returns to 325°F
When fries have been fried once, bring oil temperature up to 375°F.
Drop the first batch of fries into the oil carefully, and stir occasionally until the fries are crispy and golden brown, usually 2 to 3 minutes.
Remove from oil to a bowl lined with paper towels. Toss gently to remove excess oil, then remove the paper towel. Add in spice blend and toss.
Place seasoned cajun fries on a baking sheet in the oven and fry your second batch of fries. Repeat blotting and seasoning, then serve all the fries when ready.
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If making larger or smaller fries than 1 inch sticks, you may need to increase or reduce your cooking time to adjust for fry thickness. This recipe makes the spice blend amount needed for 4 potatoes of fries. Increase if wishing to make cajun seasoning to store.