01 -
Preheat the oven to 175°C.
02 -
In a medium saucepan, melt the butter over medium heat.
03 -
In a separate bowl, whisk together granulated sugar, all-purpose flour, and cocoa powder. Gradually blend this dry mixture into the melted butter, stirring to combine.
04 -
Slowly pour in the whole milk while whisking constantly. Cook over medium heat, stirring frequently, until the mixture thickens and begins to bubble, about 5–7 minutes.
05 -
Lightly beat the egg yolks in a bowl. Whisk in a spoonful of the hot chocolate mixture to temper, then return the egg yolk mixture to the saucepan.
06 -
Continue cooking for 2–3 minutes, stirring constantly, until the custard is thickened. Remove from heat and stir in vanilla extract.
07 -
Pour the hot chocolate custard into the pre-baked pie crust, spreading evenly with a spatula.
08 -
In a clean, dry mixing bowl, beat egg whites with cream of tartar on medium speed until soft peaks form. Gradually add granulated sugar, beating until stiff, glossy peaks form.
09 -
Spread the meringue evenly over the hot filling, ensuring it seals to the crust edges.
10 -
Bake for 10–12 minutes, or until the meringue is golden brown.
11 -
Remove from the oven and cool completely on a wire rack for at least 2 hours before slicing.