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Instructions
- Preheat oven to 350°F. Spray a 9×13-inch baking dish with non-stick cooking spray. Set aside.
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To a large mixing bowl, add cake mix, sour cream, eggs, vegetable oil, and water. Stir to combine. Set aside.
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To a small bowl, add brown sugar and cinnamon. Stir to thoroughly combine. Set aside.
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Pour half of the batter into the prepared baking dish. Sprinkle the brown sugar mixture evenly over the top of the batter.
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Pour the remaining batter over the brown sugar mixture. Using a butter knife, gently swirl the batter and sugar mixture together, creating a marble pattern. Be careful not to overmix.
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Bake for 38-40 minutes, or until a toothpick inserted into the cake comes out clean.
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While the cake cools slightly, make the glaze. In a small bowl, whisk together confectioners’ sugar, milk, and vanilla.
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While the cake is still slightly warm, evenly pour glaze on the cake. Let the cake cool before serving.
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