"I always set aside some of my fresh-picked blueberries to make this tender lemon blueberry cake. Using cake mix makes it a quick and easy dessert. —Leona Luecking, West Burlington, Iowa..."
INGREDIENTS
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1/4 cup butter, cubed
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1/2 cup sugar
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2 teaspoons grated lemon zest, divided
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2 cups fresh or frozen blueberries
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1 package (9 ounces) yellow cake mix
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Whipped cream, optional