Preheat the oven to 350°F. Spray a 9x13-inch baking dish with cooking spray.
Mix the cake mix per the directions on the back of the box (combining the 15.25 ounce box strawberry cake mix with ingredients needed to make cake: water, eggs, and oil). Pour the batter into the prepared baking dish.
In a large bowl, whip the 4 (8 ounce) blocks cream cheese, softened to room temperature until smooth with an electric hand mixer.
Add 4 large eggs, 3/4 cup granulated sugar, and 1 teaspoon vanilla extract, mix until smooth.
Spoon the cream cheese mixture onto the cake batter. Bake on the middle oven rack for about 1 hour, place on a wire rack, and allow the cake cool completely.NOTE: Oven times can vary! Please go by doneness, not just by time. Some ovens have hot and cooler areas so it can vary from oven to oven.
Once completely cooled, place 1 ½ cups cold milk in a large bowl. Start adding the 3 ounce box instant vanilla pudding mix a little at a time until fully mixed in, followed by the 3 ounce box strawberry Jell-O mix.
Add half of the 16 ounce tub whipped topping (Cool Whip) and mix it in thoroughly. Add the remaining whipped topping and mix until combined with no streaks.
Smooth the topping over the cake. Cover with plastic wrap and place in the refrigerator for at least 6 hours or up to overnight. Slice and serve.
Notes
Please refer to my FAQ’s (Frequently Asked Questions) and ingredient list above for other substitutions or for the answers to the most common questions.