Preheat the oven to 180°C.
In a bowl, mix together the eggs and sugar well.
Sift in cake flour, baking powder, and cinnamon powder, and combine.
Add melted butter and milk, and gently mix until just combined.
Finely chop the pecans and fold them into the batter.
Spoon the batter into the madeleine molds.
Bake in the oven at 180°C for 12–15 minutes.