Preheat the oven to 375°F (190°C). Grease a 9-inch (23 cm) pie plate.
In a medium bowl, combine the graham cracker crumbs, 3 tablespoons of sugar, melted butter, nutmeg, cornstarch, and salt. Mix until well combined.
Press the mixture onto the bottom and up the sides of the prepared pie plate. Bake in the preheated oven for 8 minutes.
In a small bowl, stir together the espresso or strong coffee and cornstarch until the cornstarch is dissolved.
In a medium saucepan, combine the heavy cream, 3/4 cup of sugar, coffee granules, and the espresso mixture. Cook over medium heat, stirring constantly, until the mixture just starts to boil, about 5 minutes.
Remove from heat and stir in the vanilla extract.
Pour the filling into the prepared crust. Bake in the preheated oven for 15 minutes.
Remove from oven and cool to room temperature. Chill in the refrigerator for at least 4 hours before serving.
Interesting Facts
Cappuccino pie originated in the United States in the 1970s.
Cappuccino pie is a great way to use up leftover coffee.
Cappuccino pie can be served with whipped cream or topped with chocolate shavings.