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Preheat the oven to 350°F. Grease a 9x13-inch baking pan.

In a large bowl, whisk together the yellow cake mix, eggs, sour cream, vegetable oil, and water until the batter is smooth.

In a separate small bowl, mix together the brown sugar and ground cinnamon.

Pour half of the cake batter into the prepared 9x13-inch pan, spreading it evenly with a spatula.

Sprinkle the brown sugar and cinnamon mixture evenly over the batter in the pan.

Carefully pour the remaining cake batter on top of the brown sugar mixture. Gently swirl the batter a few times with a table knife or small spatula to create a marbled effect.

Bake in the preheated oven for 35 to 40 minutes, or until the cake is lightly golden brown and a toothpick inserted into the center comes out clean.

While the cake is baking, prepare the icing. In a bowl, stir together the confectioners’ sugar, milk, and vanilla extract until the mixture is smooth and runny.
Immediately after removing the cake from the oven, pour the prepared icing evenly over the hot cake.

Allow the cake to cool completely before serving. This allows the icing to set and the sugar on the bottom to caramelize, creating a delicious crust.


Preheat the oven to 350°F. Grease a 9x13-inch baking pan.

In a large bowl, whisk together the yellow cake mix, eggs, sour cream, vegetable oil, and water until the batter is smooth.

In a separate small bowl, mix together the brown sugar and ground cinnamon.

Pour half of the cake batter into the prepared 9x13-inch pan, spreading it evenly with a spatula.

Sprinkle the brown sugar and cinnamon mixture evenly over the batter in the pan.

Carefully pour the remaining cake batter on top of the brown sugar mixture. Gently swirl the batter a few times with a table knife or small spatula to create a marbled effect.

Bake in the preheated oven for 35 to 40 minutes, or until the cake is lightly golden brown and a toothpick inserted into the center comes out clean.

While the cake is baking, prepare the icing. In a bowl, stir together the confectioners’ sugar, milk, and vanilla extract until the mixture is smooth and runny.
Immediately after removing the cake from the oven, pour the prepared icing evenly over the hot cake.

Allow the cake to cool completely before serving. This allows the icing to set and the sugar on the bottom to caramelize, creating a delicious crust.
