1/2 c. butter
1 1/2 c. sugar
1 egg, beaten
2 c. flour
1 tsp. baking soda
1/2 tsp. salt
1 c. buttermilk or sour milk
2 c. chopped rhubarb
1 tsp. vanilla

Cream butter and sugar, add egg. Sift in flour, soda, salt and milk. Blend in gently rhubarb and vanilla. Pour into 9 x 13 inch pan. Sprinkle top with 1/2 cup sugar and 1/2 teaspoon cinnamon. Bake at 350 degrees for 45 minutes.