Preheat oven to 350 degrees Fahrenheit.

In an eight-inch square pan, mix all ingredients for the crust; press down to flatten. Bake until golden brown, about 15 minutes.

In a mixing bowl, beat all cheesecake ingredients except white chocolate. Pour onto the baked crust.

Sprinkle cheesecake with white chocolate chunks. Bake 25 minutes until set.

To prepare the topping, mix sour cream and sugar.

After the 25 minutes are up, pour topping over cheesecake. Bake 10 more minutes until set.

Turn off oven. Open oven door a crack; let cake sit in oven until cool. Cool completely before slicing into bars and serving.