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1
Preheat oven to 350 degrees; lightly grease a 9x13-inch baking pan.
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2
In large bowl, beat cake mix, eggs, oil and sour cream at medium speed with an electric mixer until smooth.
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3
Spread half of cake mixture in bottom of pan.
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4
In small bowl, combine brown sugar and cinnamon.
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5
Sprinkle evenly over cake mixture in pan.
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6
Gently spread remaining cake mixture over brown sugar mixture.
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7
Bake for 35-45 minutes, or until a wooden pick inserted in center comes out clean.
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8
Let cool in pan for 5 minutes.
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9
In small bowl, whisk together confectioners' sugar, milk, vanilla and flavoring until smooth.
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10
Using a fork, pierce cake at 1-inch intervals.
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11
Drizzle icing evenly over cake.
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12
Let icing harden for 20 minutes; cut into squares to serve.
