INGREDIENTS
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2 cup white whole wheat flour (or regular whole wheat flour)
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2 cup unbleached all-purpose flour
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1 cup old-fashioned rolled oat (not quick cooking)
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2 Tbsp baking powder
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3 Tbsp granulated sugar
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2 tsp salt
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3 stick cold unsalted butter, diced
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½ cup cold buttermilk
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1 tsp pure vanilla extract
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4 eggs, lightly beaten
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1 egg wash (egg beaten with a splash of water)
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2 cup chopped fresh (or frozen or thawed) rhubarb
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1 cup powdered sugar
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5 Tbsp milk
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1 tsp pure vanilla extract