"A must make for New Year's Eve...."
INGREDIENTS
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1 box vanilla cake mix
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1 3/4 c. champagne (or Prosecco), divided
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1 c. (2 sticks) unsalted butter, softened
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4 c. powdered sugar
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1/2 tsp. pure vanilla extract
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1/2 tsp. kosher salt
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Gold sanding sugar, for garnish