Crust
1 c  Chocolate Wafer Crumbs -- *
See note
1/4 ts Ground Cinnamon
3 tb Butter Or Margarine --
Melted
Filling
32 oz Cream Cheese -- softened
3/4 c  Sugar
4    Eggs
1/2 c  Sour Cream
1 ts Vanilla
1 c  Semisweet Chocolate Chips
2 tb Orange Liqueur
1/2 ts Grated Orange Peel

* Ive just recently found Oreo Cookie crumbs in a box. A great time saver
for the lazy.

Heat oven to 325 F.

Mix crumbs, cinnamon, and butter. Press onto bottom of 9-inch springform
pan.

Bake 10 minutes.

Increase oven temperature to 350 F.

Beat cream cheese and sugar at medium speed with electric mixer until well
blended. Add eggs, one at a time, beating well after each addition. Blend
in sour cream and vanilla.

Separate batter into 2 equal parts. Blend chocolate into one part. Blend
liqueur and peel into remaining part. Pour chocolate batter over crust.
Bake 30 minutes.

Reduce oven temperatue to 325 F.

Spoon remaining batter over chocolate layer. Continue baking another 30
minutes. Turn off oven and prop open oven door; remove cheesecake when oven
has cooled. Loosen cake from rim of pan.

I think cheesecake in general is best when chilled over night, but it is
not necessary.