Preheat your oven to 350°F (175°C). In a mixing bowl, whisk together flour, baking powder, and salt. In another bowl, combine eggs, milk, vanilla extract, and sugar, mixing until smooth. Fold in dry ingredients. Pour into two greased 9-inch pans. Bake for 25-30 minutes. Cool in pans.

For the custard, heat half-and-half over medium until bubbles form, then whisk egg yolks and sugar in another bowl. Slowly combine the mixtures without scrambling. Cook gently until thickened. Cool.

For the ganache, heat cream until bubbling, pour over chocolate, and let sit for 1 minute. Stir until smooth and glossy. Cool slightly.

Assemble the pie by placing one cake layer on a platter, spreading custard on top, and adding the second layer. Pour ganache over. Chill for at least 1 hour.