Beat together the eggs and granulated sugar using a hand or stand mixer set on medium speed until smooth and creamy--ten minutes
Add the orange extract and zest and mix just to combine.
Add in the flour and baking powder and fold them in gently so the egg mixture does not deflate.
Fold in the melted butter.
Place the madeleine batter in the fridge to chill for one hour.
Near the end of the chilling step, preheat the oven to 350° F and grease a standard madeleine pan with melted butter and non-stick cooking spray.
Scoop batter in the molds until they are ¾ full and bake until the madeleines are light brown--about 12-13 minutes.
Transfer the madeleines to a wire rack to cool.
Enjoy immediately or store in an airtight container at room temperature for up to 3 days.
Notes
For the zest and extract, you can use orange or lemon--or a mix of the two.
Start with room temperature eggs to get the most volume out of the batter.
Let the melted butter cool for a few minutes before folding it into the batter. This will help keep the batter fluffy.
Fold the ingredients into the egg and sugar mixture. Folding will ensure that the gluten in the flour does not activate, which would make the cookies more dense.
Use non-stick pan spray and spread melted butter in the madeleine molds for easy removal and crispy, buttery edges.