Death by Chocolate Cupcakes

Name: Death by Chocolate Cupcakes
Prep time: 25 min
Cook time: 18 min
Total time: 43 min
Cuisine: American
Ingredients: 1/2 cup (8 Tbsp; 113g) unsalted butter; 2 ounces 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*; 2 and 3/4 cups (330g) confectioners’ sugar; 2/3 cup (55g) unsweetened cocoa powder; 6 Tablespoons (85g) unsalted butter, softened to room temperature; 6 Tablespoons (95ml) heavy cream; optional: 1/3 cup (60g) semi-sweet chocolate chips for decoration