For the Cupcakes:

• 1 cup all-purpose flour
• 1/2 cup unsweetened cocoa powder
• 3/4 teaspoon baking powder
• 1/2 teaspoon baking soda
• 1/4 teaspoon salt
• 1/2 cup granulated sugar
• 1/2 cup brown sugar
• 1/2 cup unsalted butter, melted
• 2 large eggs
• 1/2 cup buttermilk (or milk + 1/2 tsp vinegar)
• 1/4 cup freshly squeezed orange juice
• 1 tablespoon orange zest
• 1 teaspoon vanilla extract
• 1/2 cup dark chocolate chips

For the Chocolate Orange Frosting:

• 1 cup unsalted butter, softened
• 2 1/2 cups powdered sugar
• 1/2 cup unsweetened cocoa powder
• 1/4 teaspoon salt
• 2 tablespoons heavy cream (or milk)
• 2 tablespoons orange juice
• 1 teaspoon orange zest
• 1 teaspoon vanilla extract

For Garnish (Optional):

• Chocolate shavings or curls
• Orange zest
• Small orange slices or candied orange peel