To prepare the crust, combine the first 3 ingredients in a bowl; toss with a fork until moist. Press mixture into the bottom of a 9-inch springform pan coated with cooking spray.
To prepare filling, combine cocoa and Kahlua, and stir well with a whisk. Beat cheeses and sour cream at high speed of a mixer until smooth. Add 1 1/4 cups sugar, flour, and vanilla; beat well. Add eggs and egg whites, 1 at a time, beating well after each addition. Stir in cocoa mixture.
Pour mixture into prepared pan; bake at 325° for 1 hour and 5 minutes or until almost set. Cheesecake is done when the center barely moves when pan is touched. Remove from oven; run a knife around outside edge. Cool to room temperature. Cover and chill at least 8 hours. Garnish with coffee beans, if desired.