Preheat Oven to 325 Degrees
In a large bowl combine Pumpkin, Sugar, Brown Sugar, Eggs, Oil and Vanilla.
Slowly add in Flour, Pumpkin Spice, Baking Soda and Salt and Mix well.
Pour Cake Batter into a 9x13 Baking Dish.
In a separate bowl beat the Cream Cheese, Sugar, Egg Yolk, and Vanilla until combined.
Spoon Cream Cheese Mixture onto Cake Mixture and swirl using a knife.
Bake 50 minutes at 325 Degrees or until center is set.
Allow to cool before serving.