Melt the butter over low heat.
Grease the madeleine mould with melted butter and then dust with flour.
Preheat oven to 210°C / 410˚F.
Beat the eggs in a small bowl.
In a mixing bowl, place the eggs, sugar, milk and vanilla extract.
Add the melted butter, flour and yeast and stir until combined.
Add the mixture to the greased madeleine mould until half full.
Add a dollop of hazelnut spread to each madeleine and top with the remaining mixture until full.
Bake for 10 minutes in the oven until perfectly golden.
