01 -
Preheat oven to 350°F (177°C) and grease a 9x13-inch baking dish.
02 -
In a large mixing bowl, combine the angel food cake mix, one box pistachio pudding mix, vegetable oil, eggs, and crushed pineapple with juices.
03 -
Beat the mixture with an electric mixer or whisk until batter is smooth and thoroughly blended.
04 -
Pour the batter into the prepared 9x13-inch dish and bake for 30 to 35 minutes, or until a toothpick inserted in the center comes out clean.
05 -
Remove cake from oven and allow to cool completely in the pan on a wire rack.
06 -
Whisk together the second box of pistachio pudding mix with whole milk in a bowl until the mixture thickens.
07 -
Gently fold the thawed whipped topping into the thickened pudding mixture until well incorporated.
08 -
Spread the frosting evenly over the cooled cake, then refrigerate for at least 2 hours before serving.
09 -
Sprinkle chopped pistachios over the frosted cake just before serving.