Preheat the oven to 175°
In a large bowl whisk together the butter and sugar until fluffy. Add the eggs one by one, mix, then add the rum or Amaretto.
In a separate bowl, mix the flour and baking powder, and then add to the liquid batter.
Grease the Madeleine molds and start adding 1 ½ tsp to every shell. Be careful not to add too much batter as it might impact the rising of your Madeleines.
Bake for 12-15 minutes. Keep an eye on your Madeleines from minute 12 onwards. As all ovens are different, baking time might differ form one to another. Repeat until all the batter is gone.
Enjoy!!!