I've made this quite a few times for birthdays at work...everyone hands down loves it!Link at recipezaar1 1/4 hours, 30 minute prep, serves 12Ingredients1 1/2 cups finely crushed chocolate wafer cookies 1 cup white sugar 1/4 cup melted butter 2 (8 ounce) packages cream cheese, diced 2 cups sour cream 3 egg 2 teaspoons vanilla extract 1/4 cup butter 1/4 cup packed brown sugar 1/4 cup white sugar 2 tablespoons water 1 teaspoon vanilla extract 1/2 cup all-purpose flour 1 cup semi-sweet chocolate chips 2 teaspoons white sugar Directions1. Preheat oven to 350 degrees F (175 degrees C). 2. Mix the chocolate wafer cookie crumbs with 2 tablespoons of the white sugar, and the melted butter. Press firmly into the bottom and 1/2 inch up the sides of one 9 inch springform pan. Bake at 350 degrees F (175 degrees C) for about 8 minutes. 3. To Make Cookie Dough: In a bowl beat 1/4 cup butter or margarine with the brown sugar and 1/4 cup of the white sugar. Stir in the water and 1 teaspoon of the vanilla. Beat in the flour and the semisweet chocolate chips. Stir until combined. 4. To Make Cheesecake: In a food processor or with a mixer beat 1 cup of the white sugar, and all the cream cheese. Add 1 cup of the sour cream, the eggs, and 1 teaspoon of the vanilla. Mix well and pour into prepared crust. 5. Drop cookie dough in 2 tablespoon portions evenly over the top of the cake, pushing dough beneath the surface. Bake at 350 degrees F (175 degrees C) for about 40 minutes. Cake will jiggle slightly in center. Spread topping over hot cake. Let cake cool than chill in a refrigerator until cold, at least 4 hours. 6. To Make Topping: Mix the remaining 1 cup sour cream, 1 teaspoon vanilla, and the 2 teaspoons white sugar until smooth. Spread over hot cake.