Heat a skillet on medium heat with the coconut oil, enough for a thin layer on the bottom of the pan. Let it heat up for about two minutes.
When the oil is hot, add the plantains in a single layer. You can do this without burning yourself by sliding them down the side of the pan, them moving them over with a fork or spatula.
Cook for about 2 minutes on each side, until lightly browned. Watch them closely so they don’t burn! Carefully flip with a small metal spatula or fork, and sprinkle with cinnamon and sea salt.
Turn the heat to medium-low, and let them go for about another minute on each side if they’re not cooked all the way through.