Step 1: Preheat and Prepare the Pan

Preheat the oven to 350°F (175°C). Grease a 9×13-inch baking pan thoroughly and set aside.

Step 2: Mix the Cake Batter

In a large bowl, whisk together the flour, sugar, and baking soda until evenly combined.

Add the eggs, vanilla, and the entire can of crushed pineapple with juice. Stir until the batter is smooth and fully blended. The batter will be thick but pourable.

Step 3: Bake the Cake

Pour the batter into the prepared pan and spread evenly.

Bake for 35–40 minutes, or until the top is golden and a toothpick inserted in the center comes out clean.

Step 4: Make the Topping

While the cake bakes, prepare the topping.

In a medium saucepan over medium heat, combine the butter, evaporated milk, sugar, and vanilla. Stir constantly until the butter melts and the mixture begins to gently bubble.

Add the chopped pecans or walnuts and coconut flakes. Continue stirring and cook for 2–3 minutes, until the topping thickens slightly.

Step 5: Finish the Cake

Remove the cake from the oven and immediately pour the hot topping evenly over the warm cake. Spread gently if needed to cover the surface.

Allow the cake to cool so the topping can set before slicing.