Pineapple Orange Upside Down Cake/ 鳳梨柳橙倒置蛋糕

Pineapple orange upside down cake Preheat oven at 350F, bake for 35 to 40 minutes. A 9 inch round baking pan Ingredients: A. 170 g all purpose flour 1 teaspoon baking powder 1/2 teaspoon salt B. 3 tablespoons butter 1/3 cup brown sugar 1 Fresh orange  1 can pineapple rings C. 1/2 cup butter (softened) 1/3 cup brown sugar 1/3 cup granulated sugar 2 Eggs 1 teaspoon vanilla extract 1/3 cup milk