01 -
Preheat the oven to 350°F (175°C). In a mixing bowl, combine the French vanilla cake mix, eggs, whole milk, melted butter, and sour cream. Whisk until smooth. Pour the batter into a greased 9x13-inch cake pan.
02 -
Bake the cake for approximately 30 minutes, or until a toothpick inserted into the center comes out clean. Allow the cake to cool completely.
03 -
In a mixing bowl, whisk the banana cream instant pudding mix with 3 cups of whole milk until thickened. Stir in half of the crushed pineapple.
04 -
Using the end of a wooden spoon or a skewer, poke holes all over the cooled cake. Pour the prepared pudding mixture evenly over the cake, ensuring it fills the holes.
05 -
Spread the thawed Cool Whip evenly over the top of the pudding layer. Sprinkle the remaining crushed pineapple on top of the Cool Whip.
06 -
Refrigerate the cake for at least 4 hours or overnight to allow the flavors to meld together. Slice and serve chilled.