1In a 9x13 pan pour half the cake batter in... then sprinkle the brown sugar cinnamon mixture over, then add the rest of the batter... use a knife and swirl the batter and brown sugar mixture together.
Bake in a 350 degree oven for 40-45 minutes.
While cake is still hot... heat one cup of milk and using a fork, poke holes in the cake and pour the cup of hot milk over the cake.
Make a glaze using 2 cups powdered sugar and 2 Tbsp. milk or half and half. Pour over hot cake.