Cut the butter into small pieces, add them to the preheated water, and stir until melted.

Add the flour and stir to dry out the dough.

Remove the pan from the heat, then add the eggs one at a time, mixing well after each addition. Add the salt.

Cut the ham into small pieces, add to the mixture, and stir.

Add the Swiss cheese and mix everything together. Finally, add a pinch of nutmeg.

Using two spoons, form small balls of dough and place them on a baking sheet.

Enjoy your gougères!