Walnut Streusel Coffee Cake
["1/3 c. margarine", "1/2 c. sugar", "2 eggs", "1 1/2 c. flour", "1 tsp. baking powder", "3/4 tsp. salt", "1/2 tsp. baking soda", "3/4 c. sour cream", "1 tsp. vanilla"]
["Cream butter, sugar and eggs.", "Add flour, baking powder, salt and baking soda, alternately with sour cream.", "Add vanilla.", "Spread half of batter in greased and floured 9 x 9-inch pan.", "Sprinkle with 1/2 of the topping.", "Cover with remaining batter.", "Sprinkle rest of topping on top.", "Bake at 350\u00b0 for 25 to 30 minutes."]
["margarine", "sugar", "eggs", "flour", "baking powder", "salt", "baking soda", "sour cream", "vanilla"]