(Image from the Internet)

Ingredients:
 
1 box yellow cake mix
4 eggs
1 c. sour cream
3/4 c. vegetable oil
1 c. brown sugar
2 tsp. cinnamon

Frosting:

2 c. powdered sugar
6 Tbsp. milk
1 tsp. vanilla
 
Directions:

Preheat oven to 325 degrees.

Mix together cake mix, eggs, sour cream, and oil by hand until well combined and no lumps are present.

In a second bowl, combine brown sugar and cinnamon and mix together until well combined.

Pour half of cake batter in a greased 13x9 pan. Add half of the brown sugar mix on top of that covering all the batter.

Pour rest of batter and spread until even, top with rest of brown sugar mix. With a knife swirl your batter around.

Bake 45-50 minutes until a toothpick comes out clean.

Meanwhile mix ingredients for frosting.

When cake comes out of the oven pour the frosting on the hot cake.

Let cool or serve warm.