"These cupcakes are full of delicious surprises, from the sour cream and fresh blueberries that keep the cake moist, to the hidden cinnamon-sugar layer just underneath the frosting...."
INGREDIENTS
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6 granulated sugar
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1/4 dark-brown sugar
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1.00 cinnamon
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1.667 cake flour (not self-rising)
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1/4 baking soda
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1 baking powder
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1/2 salt
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1 unsalted butter
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2/3 granulated sugar
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2 eggs
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1 pure vanilla extract
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3/4 sour cream
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6 blueberries
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1.25 unsalted butter
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8 cream cheese
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1/2 pure vanilla extract
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2.667 confectioners' sugar
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1/4 high-quality blueberry jam