Peel and bias-slice plantains or bananas into 1/2-inch-thick slices (about 2 cups)
Melt margarine or butter in a large skillet. Add plantains or bananas to melted margarine or butter. Heat about 5 minutes for plantains (2 minutes for bananas) or just until warm and tender, gently stirring occasionally. Sprinkle with brown sugar. Stir gently until sugar melts.
Carefully stir in vanilla and cinnamon. Sprinkle with nuts. Serve immediately with Crema Espesa. Makes 4 servings.