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| all-purpose flour (unsifted): 1 1/2 cups |
| light brown sugar (packed): 3/4 cup |
| baking soda: 1/2 tsp |
| salt: 1/2 tsp |
| vegetable oil: 1/3 cup |
| eggs: 1 |
| buttermilk: 1/2 cup |
| vanilla extract: 1 tsp |
| rhubarb (diced): 1 cup (fresh) |
| walnuts (chopped): 1/2 cup |
| light brown sugar (packed): 1/4 cup |
| walnuts (chopped): 1/4 cup |
| ground cinnamon: 1/2 tsp |