Michelle's Honeybun Cake

Step 1
Preheat the oven to 350 degrees F (175 degrees C). Grease a 9×13-inch pan.

Step 2
Whisk together cake mix, eggs, sour cream, vegetable oil, and water in a large bowl until smooth.

Step 3
Mix brown sugar and cinnamon in a small bowl. Pour 1/2 of the cake batter into the prepared pan. Sprinkle brown sugar mixture over batter.

Step 4
Pour remaining batter on top; gently swirl batter a few times with a table knife.

Step 5
Bake in the preheated oven until lightly golden brown and a toothpick inserted into the center of the cake comes out clean, about 40 minutes.

Step 6
Make icing: Stir together confectioners' sugar, milk, and vanilla extract in a bowl until smooth and runny.

Step 7
Pour over hot cake; allow to cool before serving.