1. Start by making the crust. In a medium bowl, combine the graham cracker crumbs, melted butter, and sugar. Mix until the crumbs are well-coated and moist.
2. Divide the crumb mixture evenly among individual serving cups, pressing down gently to form a firm base. Set aside.
3. For the cheesecake layer, beat the softened cream cheese, powdered sugar, and vanilla extract in a large bowl until smooth and creamy.
4. Spoon the cheesecake mixture over the crust layer in each cup, smoothing the tops with a spatula. Place the cups in the refrigerator to chill while you prepare the mousse.
5. To make the chocolate mousse, heat the heavy cream in a small saucepan over medium heat until it just begins to simmer.
6. Remove the saucepan from the heat and add the chocolate chips and cocoa powder, stirring until the chocolate is completely melted and the mixture is smooth. If you want an extra depth of flavor, dissolve instant coffee in a tablespoon of hot water and add it to the mixture.
7. Allow the chocolate mixture to cool slightly, then fold it gently into the remaining whipped cream until no streaks remain.
8. Spoon the chocolate mousse over the cheesecake layer in each cup, filling them to the top. Smooth the surface with a spatula.
9. Chill the cups in the refrigerator for at least 2 hours, or until the mousse is set. For the best texture, let them sit overnight.

These steps may seem simple, but the result is a dessert that feels like an elegant indulgence. My first attempt at these cups was a hit at a family gathering, and they’ve been requested ever since!