Dice the sweet potato into even cubes to ensure uniform cooking.
Heat the coconut oil in a skillet over medium heat.
Add the sweet potato cubes to the skillet, season with cinnamon, salt, and optional cayenne pepper, and stir to coat.
Sauté the sweet potatoes for 20-25 minutes, stirring frequently, until they are tender inside and crispy outside. Adjust heat as necessary to prevent burning.