Instructions
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Make the Cake Batter: In a large mixing bowl, combine the yellow cake mix, eggs, oil, and water. Beat with an electric mixer on medium speed for 2-3 minutes, until the batter is smooth and well combined.
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Add Oranges: Gently fold the drained mandarin oranges into the batter until they are evenly distributed.
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Bake: Pour the batter into the prepared baking dish and spread it evenly. Bake for 30-35 minutes, or until a toothpick inserted into the center of the cake comes out clean.
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Cool: Remove the cake from the oven and place it on a wire rack. Allow it to cool completely in the pan before frosting.
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Make the Frosting: In a separate large bowl, whisk together the instant vanilla pudding mix and the entire can of crushed pineapple with its juices. Let this mixture sit for 2-3 minutes to thicken slightly.
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Fold in Whipped Topping: Using a spatula, gently fold the thawed whipped topping into the pineapple-pudding mixture until no streaks remain and it is smooth and fluffy.
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Frost and Garnish: Spread the frosting evenly over the completely cooled cake. Arrange the second can of drained mandarin oranges on top as a garnish.
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Chill: Refrigerate the cake for at least 30 minutes before serving to allow the flavors to meld and the frosting to set.