Preheat oven to 350 degrees and grease a 9×13 baking dish.
In a large bowl, mix together the cake mix, pudding mix, oil, eggs, and pineapple with juices. Beat until well combined.
Transfer 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.
To make the frosting: Mix together the second pudding mix and milk until the mixture thickens. Fold in the cool whip until fully combined.
Frost cake and chill for 2 hours before serving. Top with chopped pistachios if desired.
Prep Time: 15 minutes | Cooking Time: 35 minutes | Total Time: 50 minutes | Kcal: 350 kcal | Servings: 12
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