Whisk together 3 large eggs and the granulated sugar until the mixture is pale and frothy.
Stir in the orange blossom water. Gradually add the flour mixed with baking powder, then add the softened unsalted butter, mixing until smooth. Cover the batter and refrigerate for 1 hour.
Preheat your oven to 410°F (210°C). Grease a madeleine pan (if not nonstick), then fill each mold about ¾ full with batter. Bake for 10 minutes or until the madeleines are golden with their signature domed tops. These are best served immediately when they are still warm and dusted with powdered sugar. Bon appétit!