This chocolate pineapple upside-down cake is perfect for chocolate lovers. The cake is made with all-purpose flour, sugar, cocoa powder, baking powder, salt, eggs, milk, and vanilla extract. The topping is made with canned pineapple rings, brown sugar, and butter. To make the cake, mix the dry ingredients together and then add the wet ingredients. Pour the batter over the pineapple rings and bake for 30-35 minutes. Let the cake cool for a few minutes before flipping it over onto a serving platter. Serve with a scoop of chocolate ice cream for a decadent dessert.