Preheat your oven to 350°F.
In a medium bowl, stir together the crust ingredients: graham cracker crumbs, brown sugar, and butter until well blended.
Press the mixture into a 9-inch pie pan.
Bake for 9 to 11 minutes, or until the crust is browned and crisp.
Remove the crust from the oven and increase the oven temperature to 425°F.
In a small saucepan, heat the milk almost to a boil.
In a large bowl, whisk the eggs slightly.
Whisk in the granulated sugar and salt.
Gradually add the hot milk, whisking constantly.
Whisk in the vanilla.
Pour the custard through a fine sieve to remove any lumps and into the prepared pie crust.
Sprinkle the top of the custard with cinnamon.
Bake on a lower shelf of the oven for 20 to 25 minutes, until the custard is set and firm to touch.
Remove from the oven and set on a rack to cool slightly.
In a large bowl, use an electric mixer to beat the egg whites until foamy.
Gradually add the granulated sugar, continuing to beat until stiff peaks form.
Spread the meringue over the cooked custard.
Return to the oven until the meringue is slightly browned.
Cool for at least 15 minutes before serving.