Honey Bun Cake

1 pkg yellow cake mix

2/3 cup vegetable oil

4 eggs

8 oz sour cream

1 cup packed brown sugar

1/3 cup chopped pecans

2 tsp cinnamon

1 cup powdered sugar

1 Tbsp milk

1 tsp vanilla

Heat oven to 350.  Grease 13x9.  Beat dry cake mix, eggs, and sour cream.  Spread half of the batter in pan.  Stir together brown sugar, pecans and cinnamon; sprinkle over batter in pan.  Carefully spread remaining batter evenly over pecan mix.  Bake about 47 minutes.  Stir powdered sugar, milk and vanilla until thin enough to spread.  Prick surface of warm cake several times with fork.  Spread powdered sugar mix over cake.  Cool completely.