Put all Topping ingredients into a bowl and using your hand, crumble together and then set aside.
Cream sugar and butter together. Add the eggs and beat well.
In a separate bowl, combine flour, baking soda and baking powder.
Add flour mixture to wet mixture slowly and beat well. Add sour cream and vanilla and beat well.
Fold in chocolate chips last.
Pour into a buttered/greased spring form pan. Sprinkle the Topping over the top of batter.
Bake at 350 degrees for 55 minutes.
Allow the cake to cool an hour before removing outer pan ring.
After the cake is completely cooled, carefully place spatulas under the cake on at least two sides and have a second person cradle the cake with their hands and carefully life up the cake and place it on a cake plate
The topping is my favorite, so I use double the amount, except the chips.¾ cup brown sugar ½ cup butter ½ cup walnuts 2 tsp cocoa ¾ cup flour 6 oz chocolate chips