Pulverize graham crackers finely and mix with sugar, salt, cinnamon, and melted butter
Taste and adjust sugar, salt, or butter as needed
Mold mixture into a 9-10 inch pie pan, tamping down smooth
Blind bake crust at 325°F (160°C) convection or 350°F (180°C) conventional for 10 minutes
Cool crust thoroughly before filling
Mix sweetened condensed milk, egg yolks, and lime juice together for the filling
Optionally mix in lime zest or reserve for garnish
Pour filling into cooled crust
Bake at same temperature for 20-30 minutes until center firms slightly but is still wobbly
Cool thoroughly on counter before chilling overnight in refrigerator
Whip cream and flavor with sugar and vanilla to taste
Serve chilled pie with whipped cream on top and lime zest garnish
