Ingredients: 
For the crust: 
1 9-oz. box chocolate wafer cookies
6 oz. bittersweet (not unsweetened) or semisweet chocolate, coarsely chopped
1/2 cup (packed) dark brown sugar
1/8 tsp. ground nutmeg
7 tbsp. hot melted unsalted butter 
For the ganache:
1 1/2 cups whipping cream
20 oz. bittersweet (not unsweetened) or semisweet chocolate, chopped
1/4 cup Kahlúa or other coffee-flavored liqueur 
For the filling: 
4 8-oz. packages cream cheese, room temperature
1 1/3 cups sugar
2 tbsp. all purpose flour
2 tbsp. dark rum
2 tbsp. instant espresso powder or coffee crystals
2 tbsp. ground whole espresso coffee beans (medium-coarse grind) 
1 tbsp. vanilla extract
2 tsp. mild-flavored (light) molasses
4 large eggs 
For the topping:
1 1/2 cups sour cream
1/3 cup sugar
2 tsp. vanilla extract 
Espresso coffee beans (optional