Ingredients:

  Amount  Measure       Ingredient -- Preparation Method
--------  ------------  --------------------------------
   2      tablespoons   butter
   1      cup           sugar
   3                    eggs
   1      teaspoon      pure vanilla extract
   1 1/2  cups          cake flour
     1/2  cup           all-purpose flour
   1      teaspoon      baking powder
   1      teaspoon      baking soda
     1/2  pint          sour cream
                        ***TOPPING***
     3/4  cup           light brown sugar -- packed
     3/4  cup           nuts -- chopped
   2      tablespoons   butter -- softened
   4      tablespoons   all-purpose flour
     1/4  teaspoon      cinnamon
     1/4  teaspoon      salt

Preparation:

1. Cream butter and sugar; add eggs, beating with each addition, then vanilla. 2. Sift together dry ingredients and add alternately with sour cream to creamed mixture. 3. Pour half of batter into greased 9 x 12-inch pan; sprinkle with 1/2 of topping. 4. Pour and spread remaining batter; sprinkle with remaining topping. 5. Bake in preheated 350 F. oven 30 minutes. Topping Rub together all ingredients.