French Madeleines Recipe

Ingredients

• ½ cup (1 stick) unsalted butter, plus more for pans
• 1 cup sifted all-purpose flour, plus more for pans
• 4 large eggs, room temperature
• 2/3 cup sugar
• 1/4 teaspoon salt
• 1 teaspoon pure vanilla extract
• 1 teaspoon freshly grated lemon zest