Gather your cast iron skillet, vegetable oil, and cleaning supplies. Ensure the skillet is free of rust or old food residues.

Wash the skillet thoroughly with hot water and a small amount of soap if desired. Use a scrub brush or steel wool for stubborn spots.

Rinse the skillet well and dry it completely with a towel or paper towels.

Apply a thin layer of vegetable oil all over the inside and outside of the skillet using a paper towel.

Preheat your oven to 350°F. Place the skillet upside down in the oven and bake for 1 hour. Line the oven rack with foil to catch any drips.

Turn off the oven and let the skillet cool inside while the oven cools down to prevent warping.

Your cast iron skillet is now seasoned and ready to use. Repeat the seasoning process periodically for best results.