Cream together:
1/2 cup margarine 1 cup sugar
2 eggs 1 teaspoon vanilla

Add 1 cup sour cream

Sift together:
2 cups flour 1/2 teaspoon baking soda
1 teaspoon baking powder 1/2 teaspoon salt

Combine above mixture with dry ingredients and mix with mixer for 2 or 3 minutes. Then place half the mixture in a pan or tube pan. Sprinkle 1/2 of the streusel mixture on then half the batter then half the streusel mixture.

Butter and flour pan and bake at 350° for 45 minutes

Streusel Mixture:
1/2 cup brown sugar (packed) 2 tablespoons flour
2 tablespoons melted butter 2 teaspoons cinnamon
1/2 cup chopped nuts

Yields 16 pieces at 226 calories each (excluding nuts).