In a large bowl put brown sugar, oil, egg, vanilla and buttermilk. Mix well. Stir in rhubarb and walnuts. In a smaller bowl combine flour, baking soda, baking powder and salt. Then add to rhubarb mixture. Spoon batter into muffin pan 3/4 full.combine melted margarine, sugar and cinnamon and spoon over top of muffins. Press it down a little. Bake at 350-375 degrees F for 20-25 minutes.
By Robin from Washington, IA
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