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.