1️⃣ Preheat the oven
Preheat your oven to 350°F (175°C). Grease a 9×13-inch baking pan or a round cake pan generously to prevent sticking.

2️⃣ Prepare the topping
In a small bowl, mix the melted butter and brown sugar until fully combined. Spread the mixture evenly over the bottom of the prepared pan.
Arrange the pineapple rings decoratively on top of the sugar mixture. Optional: place a maraschino cherry in the center of each ring for that classic touch.

3️⃣ Make the cake batter
In a large mixing bowl, combine the yellow cake mix, crushed pineapple (with juice), sour cream, vegetable oil, eggs, and vanilla extract.
Beat until smooth and well incorporated using a hand mixer or whisk.

4️⃣ Assemble and bake
Carefully pour the cake batter over the arranged pineapple topping. Use a spatula to smooth it out evenly.
Bake for 35–45 minutes, or until a toothpick inserted into the center comes out clean.

5️⃣ Cool and invert
Let the cake cool in the pan for 10 minutes. Then run a knife around the edges to loosen it.
Place a serving platter on top and invert the cake so the pineapple topping is beautifully displayed on top.

6️⃣ Serve and enjoy
Slice and serve warm or at room temperature. Top with whipped cream or a scoop of vanilla ice cream for an extra indulgent treat!