Round up all your ingredients, and heat peanut oil and butter in a large skillet over medium-high heat until butter begins to sizzle.

Gently toss plantain slices with brown sugar, then place into hot oil. Fry until plantains begin to turn golden brown, then turn over, and continue frying until caramelized, about 2 minutes per side.

Drain plantains on a paper towel-lined plate and sprinkle with salt before serving.