Wash the skillet with warm water and mild soap if needed
Scrub off any rust or old residue
Dry the skillet completely
Preheat the oven to 400–450°F
Apply a very thin layer of oil all over the skillet
Use a high-smoke-point oil such as flaxseed, vegetable, canola, or grapeseed oil
Wipe off all excess oil until the surface looks almost dry
Place the skillet upside down on the oven rack
Put foil or a baking sheet on the lower rack to catch drips
Bake for 1 hour
Turn off the oven and let the skillet cool inside
Repeat the oiling and baking process 2–3 times for a stronger seasoning
Use the skillet regularly to maintain the seasoning
Dry it immediately after washing
Rub a light coat of oil on it after each use