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To make crust: Combine crumbs and butter in a bowl; toss with a fork until moist. Press into bottom of a greased 9" springform pan.
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To make filling: Beat cream cheese with a mixer on high speed until smooth. Add sugar, milk, vanilla; beat well.
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Add eggs and egg white, one at a time; beat well after each. Divide filling in half. Add melted chocolate to 1/2 filling and mix well.
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Pour 1/3 white batter into pan. Pour 1/2 chocolate batter in center of white batter; spread to within 1" of edge. Pour 1/3 white batter over chocolate; spread to within 1" of edge.
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Pour remaining chocolate on white; spread 1" from edge. Finish with white batter, spread 1" from edge.
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Bake at 325 degrees for 1 hour and 10 minutes or until almost set, when the center barely moves. Cool, cover, chill.