Streusel

Streusel Mixture:
1/2 cup brown sugar
2 tbsp butter or margarine, softened
2 tbsp flour
1 tsp flour
1 tsp cinnamon
1/2 cup chopped walnuts

Batter:
1 1/2 cups flour
2 1/2 tsp baking powder
1/2 tsp salt
1 egg
3/4 cup sugar