INGREDIENTS
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Cake
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1 and 2/3 cup (210g) all-purpose flour, careful not to overmeasure
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1/2 teaspoon baking powder
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1/4 teaspoon baking soda
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1/2 teaspoon salt
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1/2 cup (1 stick or 115 g) unsalted butter, melted
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3/4 cup (150g) granulated sugar
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1/4 cup (50g) light brown sugar
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1 large egg
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1/4 cup (60g) yogurt (plain or vanilla; or greek yogurt; or sour cream)
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3/4 cup (180ml) milk (cow's milk; or soy milk; or almond milk)
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1 Tablespoon (15ml) vanilla extract
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2/3 cup (90g) sprinkles (not nonpareils)
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Vanilla Buttercream
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1 cup (2 sticks or 230g) unsalted butter, softened to room temperature
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3-4 cups (360-480g) powdered (confectioners') sugar
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1/4 cup (60ml) heavy cream (see note above about substituting milk or half-and-half)
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2 and 1/2 teaspoons vanilla extract
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salt, as needed