Sour Cream Coffee Cake - cooking recipe

Ingredients

1 box yellow cake mix (do not use mix that calls for extra butter)
1/4 c. firm butter
1 c. brown sugar
3/4 c. chopped pecans
3 eggs
1 1/2 c. sour cream

Preparation

Topping:
In small bowl, cream 2/3 cup dry cake mix, brown sugar and pecans.
Cut in butter and set aside.