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Preheat oven to 350 degrees F.
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Place blintzes in a 9 x 13-inch pan.
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In a medium bowl, mix together sour cream, sugar, orange juice, eggs, butter, vanilla and salt. Pour mixture over blintzes.
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Sprinkle with cinnamon sugar.
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Bake, uncovered, at 350 degrees for 45 minutes, until puffed and golden. Serve with sour cream on the side, if desired.