2 (3 ounce) packages black cherry-flavored gelatin mix (such as Jell-O®)
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1.75 cups boiling water
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1 (16 ounce) carton sour cream
Instructions
Mash jellied cranberry sauce in a 3-quart bowl. Stir in gelatin mix until thoroughly combined. Pour in boiling water; stir until gelatin has dissolved completely, about 3 minutes. Chill in the refrigerator until softly set, 2 to 3 hours.
Gently fold sour cream into chilled cranberry gelatin, leaving marbled streaks of sour cream and gelatin. Return to the refrigerator until firmly set, 4 hours to overnight. Store leftovers in the refrigerator.