preheat oven to 325 or 350 depending on how fast your oven cooks

using a hand mixer; mix together cake mix,oil,eggs, sour cream and vanilla.

pour mixture into a greased 9×13 pan

next mix together brown sugar and nuts (optional ) in a separate bowl

swirl cinnamon mixture into the cake using a knife

bake for about 35-45 minutes or until a toothpick comes clean

mix together milk confection sugar and vanilla

pour over cake while hot. can be served warm or chilled

enjoy!