Preheat the oven to 350°F (175°C). In a bowl, combine graham cracker crumbs, sugar, and melted butter. Mix until well combined. Press the mixture into the bottom and sides of a 9-inch pie pan.

Bake the crust

Bake the crust in the preheated oven for about 8-10 minutes or until lightly golden. Remove from oven and let cool.

Filling Preparation

Prepare the filling

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

Fill the crust

Pour the filling into the cooled crust and spread evenly.

Bake the pie

Bake the pie in the oven at 350°F (175°C) for 15 minutes. Remove from oven and let cool to room temperature, then refrigerate for at least 3 hours.

Topping and Coulis

Prepare the topping

In a small bowl, mix sour cream, powdered sugar, and lime zest until smooth. Spread over the chilled pie.

Prepare the coulis

For the coulis, blend mango and raspberry puree together until smooth. Drizzle over slices of pie when serving.