Preheat oven and line pans:
Set oven to 350°F (175°C). Insert paper liners into two muffin pans.Whisk dry ingredients:
In a large bowl, combine flour, baking powder, and salt with a whisk.Beat yolks with sugar:
Using a stand mixer fitted with the paddle attachment (or a hand mixer), beat egg yolks with 3/4 cup (150 g) sugar on high until light and thick. Stir in milk and vanilla until blended.Fold yolk mixture into dry:
Add the yolk mixture to the dry ingredients, folding gently until just incorporated (avoid overmixing).Whip egg whites to stiff peaks:
In a separate clean mixer bowl with whisk attachment (or using a hand mixer), beat egg whites on high until soft peaks develop. Slowly add the remaining 1/4 cup (50 g) sugar, beating until stiff peaks form.Fold whites into batter:
Fold the beaten whites into the batter using a rubber spatula, taking care not to overmix.Fill liners and bake:
Spoon batter into each liner, filling about two-thirds full. Bake at 350°F (175°C) for 14-16 minutes, until a toothpick inserted in the center emerges with a few moist crumbs.