Step 1

Preheat oven to 350 degrees and grease a 9x13 baking dish.

Step 2

In a large bowl, mix together the cake mix, pudding mix, oil, eggs, and pineapple with juices. Beat until well combined.

Step 3

Transfer batter to the prepared baking dish and bake for 30-35 minutes or until an inserted tooth pick comes out clean. Allow cake to cool.

Step 4

To make the frosting: Mix together the second pudding mix and milk until the mixture thickens. Fold in the cool whip until fully combined.

Step 5

Frost cake and chill for 2 hours before serving. Top with chopped pistachios if desired.