"You can substitute fresh or frozen (thawed) blackberries or raspberries...."
INGREDIENTS
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1 cup butter, divided
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1 (18 1/4 ounce) package yellow cake mix
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4 large eggs
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1 (8 ounce) package cream cheese, softened
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6 tablespoons fresh lemon juice
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2 tablespoons grated lemon zest
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1 (16 ounce) box powdered sugar
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2 cups fresh blueberries or 2 cups frozen blueberries, thawed, drained, and patted dry