Beat in a mixer 1/2 cup of butter or margarine, 1/2 cup of sugar, 3 eggs, 1 tablespoon of baking powder, and 1 teaspoon of vanilla. Pour the mixture into a greased 18x25 cm pan. Top with 2 cups of fresh pineapple slices. Sprinkle with a mixture of 3 tablespoons of sugar and 1 tablespoon of ground cinnamon. Bake in a preheated hot oven (200°C) for about 30 minutes or until, inserting a toothpick, it comes out clean.
Beat in a mixer 1/2 cup of butter or margarine, 1/2 cup of sugar, 3 eggs, 1 tablespoon of baking powder, and 1 teaspoon of vanilla. Pour the mixture into a greased 18x25 cm pan. Top with 2 cups of fresh pineapple slices. Sprinkle with a mixture of 3 tablespoons of sugar and 1 tablespoon of ground cinnamon. Bake in a preheated hot oven (200°C) for about 30 minutes or until, inserting a toothpick, it comes out clean.