Crust
2 1/2 cups chocolate cookie crumbs (I used one full box of crushed chocolate Teddy Grahams, but you could use any chocolate wafer cookies, chocolate graham crackers, or even Oreos)
5 tablespoons butter, melted
Cookie Dough
1/2 cup butter, softened
1/2 cup sugar
1/2 cup packed light brown sugar
1/4 teaspoon salt
2 tablespoons water or milk
1 teaspoons vanilla extract
1 cup all-purpose flour
2/3 cup chocolate chips
1/2 cup chopped walnuts, optional
Filling
2 (8-ounce) blocks regular cream cheese, softened to room temperature
2 (8-ounce) blocks reduced-fat cream cheese, softened to room temperature (I used 2/3 fat- do not use non-fat)
1 cup sugar
4 large eggs
1 teaspoon all-purpose flour
1 teaspoon vanilla
1 cup sour cream
1 cup chocolate chips, divided
1/4 cup chopped walnuts
Garnish
1 cup whipping cream with 2 teaspoons sugar
Additional chocolate chips for sprinkling, if desired