Chocolate Marble Cheesecake

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Preheat oven to 450 degrees.

Add cream cheese , 3 / 4 cups sugar , sour cream and 2 teaspoons vanilla in large mixer bowl.

Beat on medium speed until smooth.

Add flour , 1 tablespoon at a time , blending well.

Add eggs.

Beat well.

In a small bowl , combine cocoa and 1 / 4 cup sugar.

Add oil , 1 / 2 teaspoon vanilla and 1-1 / 2 cups of the cream cheese mixture.

Mix until well blended.

Aternately spoon plain and chocolate mixtures into prepared crust , ending with dollops of the chocolate on top.

Gently swirl with knife or spatula for a marbled effect.

Bake at 450 degrees for 10 minutes.

Without opening oven door , lower temperature to 250 degrees and continue cooking for 30 minutes more.

Without opening oven door , turn off heat and let cheesecake sit in oven for 30 minutes.

Remove from oven and loosen sides with knife.

Let cool and chill.

crumb-nut cheesecake crust, cream cheese, sugar, sour cream, vanilla, eggs, flour, cocoa, vegetable oil