"Any excuse to make Jell-O...."
INGREDIENTS
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Cooking spray
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1 (15.25-oz.) box white cake mix, plus ingredients called for on box
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1 (3-oz.) box strawberry-flavored gelatin (preferably Jell-O)
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1 1/2 c. heavy cream
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1/3 c. sour cream
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1/4 c. confectioners' sugar
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1 tsp. pure vanilla extract
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1/4 tsp. kosher salt
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Sliced fresh strawberries, for serving