This gluten-free pineapple upside-down cake recipe is perfect for those with gluten sensitivities. The cake batter is made with a combination of gluten-free flour, almond flour, sugar, baking powder, salt, butter, eggs, and milk in the food processor. The pineapple topping is made the same way as the classic recipe. The cake is baked until golden brown and served warm. It's a delicious and satisfying dessert that everyone can enjoy.