材料:
A) 1/2 cup butter
1/2 cup white sugar
3 eggs
B) 3 cups all-purpose flour
1 tablespoon baking powder
1 teaspoon baking soda
1/2 teaspoon salt
C) 1 teaspoon vanilla extract
1/2 cup water
1 cup sour cream
D) 1 cup chopped walnuts
1/2 cup brown sugar
2 teaspoons ground cinnamon 1-2 cups chopped apple (optional)