Spray a 9 x 13 baking dish with non-stick cooking spray with flour in it. Preheat oven to 350 degrees.
Pour box cake mix into large mixing bowl. Add ingredients listed on back of box cake mix. Whisk until combined.NOTE: for a more bakery style cake switch out milk for the water, melted butter for the oil in same amounts. Pour cake batter into prepared baking dish. Sprinkle with white morsel chips. Set baking dish off to the side. (DO NOT BAKE AT THIS TIME.)
In a large bowl blend together softened cream cheese, vanilla extract, and melted butter using an electric hand mixer. Slowly add in powdered sugar 1 cup at a time until well combined.
Dollop cream cheese mixture all over cake batter. Using a knife, swirl the cake batter, chips, and cream cheese mixture carefully until is has a swirl consistency.
Bake in oven for 40-45 minutes until cooked through. Use a toothpick to test cake to make sure batter is done.
Cool cake completely. Top with sliced fresh strawberries and whipped topping.
