Honeybun Cake

1 box yellow cake mix, 4 eggs, 3/4 cup oil, 8 oz. sour cream.  Mix ingredients, spread 1/2 of cake mixture in a greased 9 x13 cake pan.  Sprinkle 1/2 of the following mixture on top:

1 cup brown sugar mixed with 1 tbsp. cinnamon

spread remaining cake mixture on top sprinkle remaining brown sugar mixture on top and swirl with butter knife.  Bake at 350 degrees for 35 min or until done.    Glaze cake when cooled.

Glaze for cake:  2 cups powdered sugar, 5-6 tbsp evaporated milk, and 1 tsp. vanilla.