This decadent Chocolate Mousse Cups recipe offers a rich, airy dessert that combines smooth bittersweet chocolate with espresso-infused egg yolks and whipped cream for a perfectly balanced treat. Chilled to firm perfection and garnished with whipped cream, chocolate shavings, and fresh berries, these mousse cups are elegant yet easy to prepare, ideal for impressing guests or indulging in a luxurious homemade dessert.