1 tablespoon hot water
2 teaspoons instant espresso powder
1 1/2 cups skim milk
1 (1.4 ounce) package instant sugar-free chocolate pudding mix
1 1/2 cups fat-free whipped topping, divided
16 chocolate wafer cookies, crumbled
Stir hot water and espresso powder together in a small bowl until dissolved; cool to room temperature.
Whisk skim milk and pudding mix together in a bowl until well combined. Whisk in espresso mixture and fold in 1/2 cup whipped topping.
Spoon 2 tablespoons pudding into each shot glass. Top pudding layer with 2 teaspoons cookie crumbs, 2 tablespoons pudding, and 2 more teaspoons cookie crumbs. Garnish each mousse shot with 1 tablespoon whipped topping.