Ingredients
Scale
- 2 1/2 cups all-purpose flour
- 1 teaspoon baking soda
- 1 teaspoon baking powder
- 1/2 teaspoon salt
- 1 1/4 cups packed brown sugar
- 1 cup buttermilk
- 1/2 cup vegetable oil
- 1 large egg
- 1 teaspoon vanilla extract
- 1 1/2 cups chopped rhubarb
- 1/2 cup chopped walnuts
- 1/3 cup granulated sugar
- 1 tablespoon melted butter
- 1 teaspoon ground cinnamon