⁄ tsp vanilla extract cup all purpose flour ⁄ tsp baking powder ⁄ tsp salt cups rhubarb (fresh or frozen), diced ⁄ cup granulated sugar tbsp cointreau – optional ⁄ cup white chocolate chips pre-heat oven to f and grease a x square oven proof pan. over a double boiler, melt the white chocolate and butter...