1 1/4 c. brown sugar
1/2 c. oil
1 egg
2 tsp. vanilla
1 c. buttermilk
1 1/2 c. diced rhubarb
1/2 c. walnuts
2 1/2 c. flour
1 tsp. baking powder
1 tsp. baking soda
1/2 tsp. salt
1 tbsp. melted butter
1/3 c. sugar
1 tsp. ground cinnamon

Mix all ingredients and fill greased or paper lined baking tins 3/4 full. Sprinkle tops with sugar. Bake for 20 to 25 minutes at 400 degrees.