1 1/4 c. brown sugar
1/2 c. oil
1 egg
1 tsp. vanilla
1 c. buttermilk
1 c. rhubarb
1/2 c. walnuts
2 1/2 c. flour
1 tsp. baking soda
1 tsp. baking powder
1/2 tsp. salt

TOPPING:

1 tsp. melted butter
1/2 c. sugar
1 tsp. cinnamon

Mix topping ingredients well. Mix together muffin ingredients; put dough in muffin tins and put topping on each uncooked muffin. Bake at 350 degrees for 20 to 25 minutes.