Preheat your oven to 350 °F (175 °C) and grease a 9×13-inch baking pan.

In a large bowl, combine the cake mix, pineapple juice, vegetable oil, and eggs. Mix on medium speed until the batter is smooth and well blended.

Pour the batter into the prepared pan and spread it evenly.

Bake for 30–35 minutes, or until a toothpick inserted into the center comes out clean.

Allow the cake to cool in the pan for about 10 minutes, then transfer it to a wire rack to cool completely.

While the cake cools, whisk together powdered sugar, pineapple juice, and melted butter until smooth to make the glaze.

Drizzle the glaze over the cooled cake, letting it soak in for extra moisture and sweetness.

Slice and serve, pairing with whipped cream or ice cream if desired.