In a large cast iron skillet, heat up 2 tablespoons of the oil. One sizzling, add the sweet potatoes and stir to coat. Cook and stir, uncovered, until the outside of the potatoes begin to turn brown. Add 2 teaspoons of the seasoning and stir again. Cover the skillet and continue cooking until the potatoes are soft throughout. Be sure to take the cover off and give them a stir every 5 minutes so they do not burn. If they are too dry, add a bit more oil. This will take roughly 10-12 minutes.