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| all-purpose flour (sifted): 1 1/2 cups |
| oatmeal: 1 1/4 cups |
| light brown sugar (packed): 1 1/2 cups |
| salted butter (melted): 3/4 cup |
| ground cinnamon: 1 tsp |
| rhubarb (chopped): 4 cups |
| granulated sugar: 1 cup |
| vanilla extract: 1 tsp |
| cornstarch: 2 Tbl |
| water: 1 cup |
| red food coloring |
Credit: Food.com