Rhubarb Walnut Muffins

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1 1/2 cups flour

3/4 cups brown sugar

1/2 teaspoon baking soda

1/2 teaspoon salt

1/3 cup vegetable oil

1 egg

1/2 cup buttermilk

1 teaspoon vanilla

1 cup chopped rhubarb

1/2 cup chopped walnuts

Topping:

1/2 cup brown sugar

1/4 cup chopped walnuts

1/2 teaspoon cinnamon