INGREDIENTS
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For the cake:
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•3/4 cup unsalted butter, softened
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•1 3/4 cup granulated sugar
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•1 1/2 tsp vanilla extract
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•2 large eggs plus 1 egg yolk
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•1 1/4 cup whole milk
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•1 1/2 cup all-purpose flour
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•1 1/2 cup cake flour
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•2 1/2 tsp baking powder
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•1/2 tsp kosher salt
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For the frosting:
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•1 cup milk chocolate morsels
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•1/4 cup unsalted butter
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•1/2 cup sour cream
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•1/4 cup dark chocolate unsweetened cocoa powder
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•pinch of kosher salt
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•3 cup powdered sugar
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•3 Tbsp whole milk
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•Sprinkles, optional