Place all ingredients in food processor until smooth. Press into a 9" springform pan. Refrigerate until ready to use.
Preheat oven to 350°F. Place chocolate and butter in double boiler, stirring occasionally until smooth. Place cream cheese, sugar and eggs in a bowl and beat until creamy. Separate cheese mixture into 2 equal parts. Add peanut butter to one half and blend well. Add chocolate to the other half and blend well. Pour chocolate mixture into springform pan. Pour peanut butter mixture on top. Bake for 1 hour. Turn oven off and allow to cool in oven.