Preheat the oven to 350 degrees Fahrenheit (175 degrees Celsius).

In a mixing bowl, combine the undrained pineapple, flour, sugar, eggs, and baking soda. Beat the ingredients together until well combined.

Grease a 9x13-inch baking dish with butter or cooking spray.

Pour the cake batter into the prepared baking dish, spreading it evenly.

Place the baking dish in the preheated oven and bake for 30-35 minutes, or until the cake is golden brown and cooked through. You can perform the toothpick test by inserting a toothpick into the center of the cake. If it comes out clean or with a few crumbs, the cake is done.

Once the cake is baked, remove it from the oven and let it cool for about 15 minutes in the baking dish.

While the cake is cooling, prepare the cream cheese icing. In a separate mixing bowl, combine the softened cream cheese, softened butter, powdered sugar, vanilla extract, and milk. Beat the ingredients together until smooth and creamy.

Once the cake has cooled slightly, spread the cream cheese icing evenly over the warm cake.

Allow the cake to cool completely before serving. This will give the icing a chance to set.

Once the cake has cooled, you can cut it into slices and enjoy!