Craft the Chocolate Cups: In a microwave-safe bowl, combine the sugar-free chocolate chips and coconut oil. Microwave for 1 minute, then stir until smooth. If needed, heat for another 20 seconds and stir again until completely melted and glossy.
Shape the Cups: Pour the melted chocolate evenly into 6 paper cupcake liners placed in a muffin pan. Gently spread the chocolate up the sides of each liner to form a cup. Place in the fridge for 1 to 2 hours, or until the chocolate is firm.
Prepare the Espresso Shot: In a small bowl, dissolve the instant espresso powder in hot water and set aside.
Whip the Cream: In a chilled mixing bowl, whip the heavy cream until soft peaks form. Set this aside in the fridge.
Cream Cheese Base: In a separate mixing bowl, use a hand mixer to lightly beat the softened cream cheese until it's smooth and airy.
Flavor the Mousse: Add the powdered sweetener, cocoa powder, dissolved espresso, and vanilla extract to the cream cheese. Mix until everything is well combined and smooth.
Fold in Whipped Cream: Gently fold the whipped heavy cream into the chocolate mixture until just combined. Be careful not to overmix, to keep the mousse light and fluffy.
Assemble and Chill: Spoon or pipe the mousse into your prepared chocolate cups. Chill them in the fridge until you're ready to enjoy these delightful treats!