01 - In a small bowl, combine the warm milk, instant yeast, and a spoonful of sugar. Stir gently and let stand for 5 minutes until the mixture becomes foamy and fragrant, indicating the yeast is active.
02 - In a stand mixer fitted with a dough hook, combine the flour, remaining sugar, and salt. Add the eggs and proofed yeast mixture. Knead on medium-low speed for 5 minutes until a shaggy dough forms. Gradually add the softened butter, one tablespoon at a time, kneading until each piece is fully incorporated. Continue kneading for about 10 minutes total until the dough is smooth, shiny, and elastic. Cover the bowl with a damp towel and let rise in a warm spot for 1 hour or until doubled in volume.
03 - In a medium saucepan, heat the milk over medium heat until steaming and small bubbles form around the edges — do not bring to a boil. In a separate bowl, whisk together the egg yolks, sugar, cornstarch, and salt until pale and smooth. Slowly pour the hot milk into the yolk mixture in a thin stream, whisking constantly to temper the eggs. Return the combined mixture to the saucepan and cook over medium heat, whisking vigorously, until thickened to a pudding-like consistency, about 3–5 minutes. Remove from heat, stir in the vanilla extract, and transfer to a bowl. Press plastic wrap directly onto the surface to prevent a skin from forming and let cool completely.
04 - Preheat the oven to 350°F. Gently punch down the risen dough to release excess air. On a lightly floured surface, roll the dough into a 12-inch round. Transfer to a parchment-lined baking sheet or pizza pan. Use your fingertips to press a raised rim around the outer edge, about 1/2 inch high.
05 - Spread the cooled custard evenly over the dough, leaving a 1/2-inch border around the rim. Sprinkle the top with 2 tablespoons of granulated sugar to promote caramelization. Arrange fresh berries or sliced stone fruit over the custard if desired. Bake for 22–25 minutes until the crust is deep golden and the custard is lightly set with a gentle jiggle. Remove from the oven and allow to cool for 10 minutes before slicing into 8 wedges. Finish with a dusting of powdered sugar if desired.