1-First Step: Get the pan and topping ready Preheat your oven to 350°F. Grease an 8-inch or 9-inch round cake pan well so the cake releases easily later. In a small bowl, stir together the crushed pineapple, lemon juice, 1/4 cup sugar substitute, and cornstarch. If you want a little crunch, mix in the pecans now. Set this mixture aside while you work on the batter. Because the pineapple is undrained, the cornstarch helps keep the topping from getting too wet. That little step matters a lot in a sugar free pineapple upside down cake since sugar substitutes do not caramelize exactly like regular sugar.

2-Second Step: Mix the wet ingredients In a medium bowl, cream the margarine and 1/2 cup sugar substitute together until smooth. Add the egg and mix again until the batter looks even. Stir in the buttermilk and reserved pineapple juice. The batter may look a little loose at this stage, and that is fine. If you are baking for someone who prefers a richer flavor, use room temperature margarine so it blends better. For a dairy-free version, use your plant-based butter and milk swap before moving on.

3-Third Step: Combine the dry ingredients In a separate bowl, whisk together the flour, baking powder, baking soda, salt, cinnamon, and cloves. This helps spread the leavening and spices through the cake evenly. A quick whisk now can save you from pockets of baking soda later. Once the dry ingredients look mixed, add them to the wet bowl. Stir gently until the batter comes together. Stop as soon as you no longer see dry flour. Overmixing can make the cake tough, and this recipe works best with a soft crumb.

4-Fourth Step: Build the cake layers Spread the pineapple mixture into the bottom of the greased pan. Spoon it out evenly so every slice gets some fruit. Then pour the batter over the top and smooth it gently with a spatula. Because this is a sugar free pineapple upside down cake, the topping will not bubble up in quite the same way as a standard version. Still, the pineapple juices will mingle with the batter as it bakes, giving the cake a moist, sweet-tart finish.

5-Fifth Step: Bake until set Bake for about 35 to 40 minutes, or until a toothpick inserted in the center comes out clean. If your oven runs hot, start checking at 32 minutes. The top should look set and lightly golden, and the edges may pull away a little from the pan. Let the cake cool in the pan for 10 to 15 minutes. This resting time helps the fruit settle and makes inversion easier. If you try to flip it too soon, the topping may slide. If you wait too long, it may stick.

6-Final Step: Turn it out and serve Place a serving plate over the pan, then carefully invert the cake in one smooth motion. Lift the pan slowly so the pineapple topping lands on top. If a few pieces stick, just place them back where they belong. That is part of the charm of a homemade cake. Serve warm or at room temperature. A small slice tastes great on its own, but it also pairs nicely with whipped topping or a spoonful of plain yogurt if you want something extra.