Peel the plantains by cutting off the ends and making a lengthwise slit in the skin. Carefully remove the skin and slice the plantains diagonally into 1-inch thick pieces.
In a large skillet, heat the vegetable oil over medium heat until hot but not smoking.
Add the sliced plantains to the skillet in a single layer, making sure not to overcrowd the pan. Fry for about 2-3 minutes on each side until they are golden brown and crispy.
Once the plantains are golden, remove them from the skillet and place them on a paper towel-lined plate to drain excess oil.
In a small bowl, mix the brown sugar, cinnamon, and a pinch of salt. Sprinkle this mixture over the hot plantains while they are still warm, tossing gently to coat evenly.
Serve immediately as a side dish or snack.