Preheat the oven to 350 degrees and grease a 9×13 baking dish.
In a large bowl, thoroughly combine the cake mix, pudding mix, oil, eggs, and pineapple with juices. Beat until the mixture is well incorporated.
Transfer the batter to the prepared baking dish and bake for 30-35 minutes or until an inserted toothpick comes out clean. Allow the cake to cool.
For the frosting, mix the second pudding mix with milk until the mixture thickens. Fold in the thawed cool whip until fully combined.
Frost the cake and chill for 2 hours before serving. Optionally, top with chopped pistachios for added decoration.
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