Recipe: Marbled Muffins

Melt the chocolate cut into pieces in a double boiler with the butter.
In a bowl, whisk the eggs with the sugar, add the flour in a thin stream while continuing to beat and the milk.
Divide the batter in two, transfer half to a bowl and add the melted chocolate. Mix well.
Then proceed to fill the molds by putting a spoonful of "white" batter, then another of chocolate.
Bake in a preheated oven at 180° for approximately 30 minutes.