Make the Mousse: In a medium bowl, combine the instant pudding mix and cold skim milk.
Using an electric mixer on medium speed, beat for about 1 ½ minutes, or until the mixture is smooth and begins to thicken.
Portion and Set: Immediately divide the mousse mixture evenly among 4 parfait glasses or small bowls.
Let them set for 5-7 minutes at room temperature to firm up.
Whip the Cream: While the mousse sets, pour the chilled heavy cream into a separate, clean mixing bowl.
Beat with an electric mixer on medium-high speed until it just begins to hold its shape.
Sweeten and Flavor: Sift the granulated sugar over the cream and continue to beat until soft peaks form. Gently stir in the chilled coffee until just combined. Be careful not to overmix.
Assemble and Serve: Top each portion of chocolate mousse with a generous dollop of the coffee whipped cream.
Serve immediately, or refrigerate for up to an hour before serving for an extra chilled treat.
Garnish with chocolate shavings, a sprinkle of cocoa powder, or a few chocolate-covered espresso beans for a coffee-shop-worthy presentation.