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PREPARE GRAHAM CRACKER CRUST--------.
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Mix cracker crumbs, sugar& melted butter.
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Press mixture onto bottom and ½ inch up side of 9 inch springform pan.
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Bake at 350° for 8 to 10 minutes.
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Cool.
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CHEESECAKE-------.
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Combine cream cheese, ¾ cup sugar, sour cream& 2 teaspoons vanilla in a large bowl; beat on med.
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speed until smooth.
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Add flour, 1 tablespoon at a time, blending well.
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Add eggs; beat well.
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COCOA MIXTURE------.
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Combine cocoa and ¼ cup sugar in small bowl.
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Add oil and ½ teaspoon vanilla.
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Add 1 ½ cups of the cream cheese mixture; mix until well blended.
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Spoon plain and chocolate mixtures alternately into prepared crust, ending with dollops of chocolate on top; gently swirl with knife for marbled effect.
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Bake at 450° for 10 minutes; do not open the oven door; decrease temp.
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to 250° and continue to bake for 30 minutes.
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Turn off oven.
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Leave the cheesecake in the oven for 30 minutes without opening the door.
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Remove from oven.
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Loosen cake from side of pan.
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Cool completely.
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Chill thoroughly.