Best Ever Piña Colada Cake

Preheat the oven to 350 degrees F (175 degrees C). Spray a 9x13-inch baking pan with cooking spray.

Blend cake mix, water, oil, and egg whites in a bowl with an electric mixer until moistened. Pour batter into the prepared pan.

Bake in the preheated oven until a toothpick inserted into the center of the cake comes out clean, 23 to 28 minutes.

Remove from the oven and poke holes into the surface of the hot cake. Pour piña colada mix over cake, followed by condensed milk. Let cool completely, at least 2 hours.

Spread whipped topping over cake, then sprinkle with coconut. Serve immediately or refrigerate until ready to serve.