Preheat your oven to 350°F (175°C). In a mixing bowl, combine graham cracker crumbs, melted butter, and sugar. Stir until well blended and crumbly.

Pour the mixture into a pie dish, pressing firmly into the bottom and sides.

Bake for 8-10 minutes, until golden brown. Keep an eye to avoid overbaking.

Let the crust cool completely on a wire rack.

In a separate bowl, whisk together sweetened condensed milk, key lime juice, and egg yolks until smooth.

Pour the filling into the cooled crust and spread evenly.

Bake again for 10-12 minutes, until edges are set but the center is slightly jiggly.

Remove from oven and allow to cool at room temperature.

Chill in the refrigerator for at least 4 hours or overnight before serving.