Preheat the oven to 180°C (356°F).
Add eggs and sugar to a bowl and mix with a whisk.
Add melted butter and vanilla extract, and mix again.
Sift cake flour, almond flour, baking powder, and cinnamon powder into the bowl and stir to combine.
Fold in the finely chopped pecans until evenly distributed.
Pour the batter into a madeleine mold and bake for 10-12 minutes.