For the chocolate muffins with Ferrero Rocher core, mix flour, cocoa, baking powder and sugar. Beat the eggs with the oil for about 5 minutes until foamy and gradually stir in the milk.
Stir the flour mixture into the egg mixture and pour the mixture into a 12-cup muffin tray lined with ramekins.
Press a piece of Ferrero Rocher into the center of each one and bake the chocolate muffins with Ferrero Rocher centers at approx. 200°C for 15-20 minutes.