The Best Chocolate Birthday Cupcakes...with Fudgy Buttercream

Bahan-bahan (24 porsi)

• 2 eggs
• 3/4 cup buttermilk
• 1/4 cup plain greek yogurt
• 1/2 cup canola oil
• 1 tablespoon vanilla extract
• 1 1/2 cups all-purpose flour
• 1 1/2 cups granulated sugar
• 1 cup unsweetened cocoa powder
• 1 1/2 teaspoons baking soda
• 1 1/2 teaspoons baking powder
• 1 teaspoon kosher salt
• 1/3 cup hot black coffee
• 1/2 cup mini semi-sweet chocolate chips (optional)
• 3 sticks (1 1/2 cups salted butter) (at room temperature)
• 3 cups powdered sugar
• 3/4 cup unsweetened cocoa powder
• 2 teaspoons vanilla extract
• 3 -4 tablespoons heavy whipping cream