Ingredients

• 1 (18.25 ounce) package yellow cake mix
• 1 cup sour cream
• 4 eggs
• 2/3 cup vegetable oil
• 1 cup brown sugar
• 3 1/2 teaspoons ground cinnamon
• 3 cups confectioners' sugar
• 3/4 cup milk
• 2 teaspoons vanilla extract

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Instructions

1. Preheat oven to 325 degrees F (165 degrees C). Lightly oil a 9x13-inch baking pan.
2. Combine cake mix, sour cream, eggs, and oil in a bowl. Beat with an electric mixer for 3 minutes. Pour half of the batter into the prepared baking pan.
3. Mix brown sugar and cinnamon together in a small bowl. Sprinkle over batter in the pan. Carefully pour the remainder of the batter over the cinnamon-sugar layer.
4. Bake in the preheated oven until a toothpick inserted into the center comes out clean, 45 to 50 minutes.
5. Mix confectioners' sugar, milk, and vanilla together in a bowl. Poke holes in the hot cake with a fork and pour sugar mixture over the top of the cake. Let cake cool completely before serving, about 30 minutes.