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Put vanilla wafers in food processor and pulse until finely chopped.
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Add 3/4 cup sugar and melted butter and pulse to incorporate.
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Grease bottom and sides of 9″ spring form pan.
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Press mixture into bottom and slightly up sides of pan.
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Place in freezer for 30 minutes.
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Beat cream cheese and remaining sugar until smooth.
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In a medium bowl, combine gelatin and boiling water. Whisk until dissolved.
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Set aside.
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Zest orange and set aside.
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Whip heavy cream, powdered sugar and vanilla until stiff peaks form.
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Add 1/2 of whipped cream mixture to cooled gelatin and add orange zest. Whisk to blend. Set aside.
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Fold remainder of whipped cream mixture into cream cheese mixture.
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Spread 1/2 cream cheese mixture over crust.
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Pour 2 cups of orange whipped cream mixture over cream cheese mixture.
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Gently spread remaining cream cheese mixture over orange mixture.
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Pour remaining orange whipped cream mixture over cream cheese mixture.
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If desired, take a butter knife and gently glide through cream cheese layers to swirl.
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Refrigerate for at least 6 hours.