– 1 cup butter – 1 cup granulated white sugar – ½ teaspoon sea salt or kosher salt – 1 teaspoon ground cinnamon – 3 large eggs – 1 ½ cup flour – 1 ½ teaspoon baking powder – 8- ounce rhubarb – 2 teaspoon vanilla extract – For Serving – 1 tablespoon large coarse brown sugar – Confectioners’ sugar
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