Preheat oven to 350 degrees and spray a 9x13 baking dish with pam baking spray.
Using a large bowl, whisk until combined and smooth the lemon cake mix, whole milk, canola oil, and eggs.
Pour into the baking dish and spread out evenly.
Using a large bowl, beat the sugar, pudding mixes, 2 cups milk, 1 ¼ cup water until combined and thick. Only whisk for about 2 minutes.
Spoon dollops of the pudding all over the top of the cake batter.
Place the baking dish onto a cookie sheet because this dessert does get messy and will drip out of the dish.
Place the cookie sheet into the oven and bake for about 50-60 minutes or until a toothpick comes out clean from the center of the cake.
Allow to cool for 30 minutes before serving with whipped cream, lemon slice and mint sprig Enjoy!