Step 1

Preheat the oven to 350 degrees Fahrenheit. Grease the bottom and sides of an 11x13-inch pan with oil or butter, or line with parchment paper.

Step 2

In a large bowl, beat the cake mix, water, butter, and eggs on low speed for 30 seconds. Increase the speed to medium and beat for 2 more minutes.

Step 3

Add the sour cream and crushed pineapple to the batter and mix until combined.

Step 4

Pour the batter into the prepared pan. Bake for 33 to 38 minutes, or until a toothpick inserted into the center comes out clean. Let the cake cool for 10 minutes in the pan, then transfer it to a wire rack to cool completely.

Step 5

Meanwhile, prepare the whipped topping. Whisk the pudding and drained crushed pineapple until combined. Gently mix in the whipped topping.

Step 6

Spread the whipped cream frosting over the cooled cake. Chill for 30 minutes before serving. Slice and enjoy!