1 box yellow cake mix
4 eggs, beaten
3/4 c. oil
1 c. buttermilk
1 c. brown sugar
2 tsp. cinnamon
1/2 c. chopped pecans (optional)

Mix first 4 ingredients well. Pour into a greased 13 x 9 baking dish. Combine brown sugar, cinnamon and pecans. Swirl into batter.

Bake at 300°F for 40 to 60 minutes. Check after 40 minutes with toothpick.

Glaze:

1 c. confectioners sugar
2 tbsp. milk
1 tsp. vanilla

Mix all ingredients together and pour over warm cake.