Sour Cream Rhubarb Cake

1/2 cup sugar
1/2  cup chopped walnuts
1 Tbsp melted Butter
1 tsp cinnamon

1 1/2 cup brown sugar
1/2 cup margarine
1 egg
2 cup AP Flour
1 tsp baking soda
1/2 tsp salt
1 cup sour cream
2 cup Rhubarb diced

Mix the first four ingredients together and set aside for topping.
Cream together the brown sugar and margarine. Add the egg.

Sift together the flour, soda and salt. Add to the. Creamed mixture alternately with the sour cream. Stir in the diced rhubarb. Turn into a greased and floured glass 9" x 12" pan. Sprinkle topping over the cake and bake 40 to 50. Minutes at 350 F.