INGREDIENTS
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1 1/2 cups packed light brown sugar (320 g)
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1 stick unsalted butter (4 ounces , 113 g, softened)
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1/2 cup smooth peanut butter (135 g)
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2 large eggs
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1/2 cup oil (99 g, vegetable, canola, avocado, any neutral oil)
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1 1/2 cups buttermilk (672 g)
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1 1/2 tsp baking powder
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1 tsp baking soda
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1 tsp salt
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4 cups all-purpose flour (480 g)
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2 tsp vanilla extract
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3 sticks unsalted butter (12 oz, 339 g, softened)
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2/3 cup smooth peanut butter (178 g)
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5 cups sifted powdered sugar (568 g, confectioner's)
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1/2 tsp vanilla extract