Preheat your oven to 325 degrees Fahrenheit (163 degrees Celsius).
In a bowl, mix together graham cracker crumbs, brown sugar, and melted butter until well combined.
Press the mixture into the bottom and up the sides of a 9-inch pie plate or springform pan.
Bake the crust in the preheated oven for 8 minutes. Remove from oven and let it cool.
In a mixing bowl, whisk together sweetened condensed milk, lemon juice, lemon zest, and egg yolks until thoroughly combined.
Pour the filling into the cooled pre-baked crust.
Return the pie to the oven and bake at 325 degrees Fahrenheit for an additional time.