Chocolate White Chocolate Cupcakes

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Ingredients

1/2 cup (8 Tbsp; 113g) unsalted butter
2 ounces (60g) quality semi-sweet baking chocolate*
1/2 cup (41g) unsweetened cocoa powder (not dutch-processed)
3/4 cup (94g) all-purpose flour (spooned & leveled)
1/2 teaspoon baking soda
3/4 teaspoon baking powder
1/4 teaspoon salt
2 large eggs, at room temperature
1/2 cup (100g) granulated sugar
1/4 cup (50g) packed light brown sugar
1 teaspoon pure vanilla extract
1/2 cup (120ml) buttermilk*
6 ounces (170g) white chocolate, coarsely chopped
1 cup (16 Tbsp; 226g) unsalted butter, softened to room temperature
2 cups (240g) confectioners’ sugar
1/4 cup (60ml) heavy cream or half-and-half*
1 teaspoon pure vanilla extract
1/8 teaspoon salt
optional for garnish: 2 ounces (57g) melted semi-sweet chocolate for drizzling and chocolate sprinkles

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