Chocolate Orange Swirl Cheesecake

Crust:
1 cup chocolate wafer crumbs
1/4 tsp ground cinnamon
3 tbsp margarine, melted

Filling:
4 8-oz packages of softened cream cheese
3/4 cup sugar
4 eggs
1/2 cup sour cream
1 tsp vanilla
1 cup semi sweet chocolate chips, melted
2 tbsp orange flavored liqueur
1/2 tsp grated orange zest

Crust: Heat oven to 325. Mix crumbs, cinnamon, and margarine. Press onto bottom of 9" springform pan. Bake 10 minutes.

Filling: Increase oven temperature to 350.

Beat cream cheese and sugar at medium speed until well blended. Add eggs, one at a time, mixing well after each addtion. Blend in sour cream and vanilla.

Blend chocolate into 3 cups batter and pour over crust, reserving about a quarter cup for swirls. Bake 30 minutes. Meanwhile, blend liqueur and zest into remaining batter.

Reduce oven temperature to 325. Pourremaining batter over chocolate layer. Spoon the reserved chocolate batter and make swirls with a knife. Continue baking for 30 minutes. Loosen cake from rim of pan. Cool. Keep refrigerated. Garnish with chocolate curls if desired.