Oven preheated to 180C (fan forced)
Melt butter on stove until foaming and nut brown.
Meanwhile combine Sugar, Flour and baking powder and whisk quickly to combine.
In a separate bowl combine egg, vanilla and milk and whisk to combine.
Add the egg mix to the flour mix and whisk to combine
Now Add the zest of both lemon and lime, and the Chia seeds and whisk.
Its time for the butter to be added in 2 batches, whisking carefully until just incorporated.
Butter a Madeleine tray and fill until 3/4 full.
Bake for 14 minutes, until just cooked. The batter should make around 18 madeleines.