Ingredients:

  Amount  Measure       Ingredient -- Preparation Method
--------  ------------  --------------------------------
                        ***CRUST***
   9      ounces        chocolate wafer cookie -- crushed (1 3/4
                        -- cups)
     1/2  cup           unsalted butter -- melted
                        ***FILLING***
  16      ounces        cream cheese -- softened
     1/2  cup           sour cream
   4                    eggs
     2/3  cup           sugar
     1/2  cup           creme de menthe
     1/4  teaspoon      mint extract
                        ***TOPPING***
   4      ounces        semisweet chocolate -- chopped
     1/2  cup           sour cream

Preparation:

Preheat oven to 350. In medium bowl combine crust ingredients; mix well. Press on bottom of ungreased 13 x 9 inch pan. Freeze crust while preparing filling. In large bowl, combine all filling ingredients; beat on low speed until smooth. Pour into crust-lined pan and bake for 30 to 35 minutes or until knife inserted in center comes out clean. Cool. Melt chocolate in double boiler. Cool 5 minutes; beat in sour cream. Spread over warm cheesecake. Refrigerate 3 hours or until firm.