Preheat oven to 350
grease and flour 10 " bundt pan
combine oatmeal and frosting dry mix
melt butter pour over oatmeal mix. stur till crumbly
mix sour cream and banana in another bowl
in another bowl mix the yellow cake mix according to directions
blend banana mixture into cake mix
sprinkle 1/3 cup oatmeal mixture into bundt pan
pour 1/2 of the cake mix into the bundt pan
repeat process ending with a layer of the oatmeal
bake for 50 - 60 min
cool for 15 min and remove from pans so that the crumbs are on top