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

Mix all ingredients and spoon into muffin tins.

Combine 1/3 cup sugar and 1 teaspoon cinnamon. Sprinkle a little over each muffin. Bake at 350 degrees for 20-25 minutes.