Sour Cream Coffee Cake

Ingredients:

Streusel Mix:
1/2 cup brown sugar - packed
2 T flour
2 t cinnamon
2 T melted butter

Cake Mix:
1/2 cup soft margarine
2 eggs
1 cup sugar
1 cup sour cream
2 cup flour
1/2 t baking soda
1 t baking powder

Instructions:
Mix streusel ingredients well and set aside.

Cream the soft margarine, and add the eggs and beat well. Add sugar and beat again, add sour cream. beat all very well, and set aside. 

Sift together (or stir together gently) the flour, baking soda, and
baking powder.  Add - flour mixture to margarine/egg/sugar mixture. 
Stir - gently until well mixed. Add - 1 t vanilla and stir in gently. 

Put - in a buttered and floured pan first 1/2 of batter, then most (80 -
90%) of streusel mix, then rest of batter, then rest of streusel mix on
top (use a round pan with the tube/post whatever you call it in the
middle). 

Preheat oven to 350, bake for 45 minutes.