TOPPING:

1/2 c. granulated sugar
1/2 c. chopped nuts
1 tbsp. butter
1 tsp. ground cinnamon

SQUARES:

1 1/2 c. brown sugar
1/2 c. shortening
1 egg
2 c. flour
1 tsp. baking soda
1/2 tsp. salt
1 1/2 c. rhubarb, cut in 1/2" pieces

Mix topping ingredients together until crumbly; set aside.

Cream together brown sugar, shortening and egg. Thoroughly stir together flour, soda and salt. Add to creamed mixture alternately with sour cream. Stir in rhubarb. Turn into greased and floured 13"x9"x2" baking pan. Sprinkle with reserved topping. Bake at 350 degrees for 50 minutes. Cut in squares. Serve warm or cold, good with ice cream.