* The 1 oz square of unsweetened Chocolate should be melted.
Combine crumbs, sugar, and margarine; press onto bottom of 9-inch Spring-
form cake pan. Bake at 350 degrees F., 10 minutes. Combine cream cheese,
sugar and vanilla, beating at medium speed on electric mixer until well
blended. Add eggs, one at a time, mixing well after each addition. Blend
chocolate into 1 cup batter. Spoon plain and chocolate batters alternately
over crust; cutting through batters with knife several times for the marble
effect. Bake at 450 degrees F., 10 minutes. Reduce oven temperature to 250
degrees F.; continue baking 30 additional minutes. Loosen cake from rim of
pan; cool before removing rim of pan. Chill.

Serves 10