For the banana chocolate muffins, cut the chocolate into pieces. Mix the eggs with butter, sugar, honey, yogurt and cinnamon.
Mix in the flour with the baking powder, then fold in the chocolate pieces and the banana (in 0.5 cm cubes).
Butter the muffin tins and fill them 2/3 full with the mixture. Bake the banana-chocolate muffins at 200 degrees (180 degrees convection oven) for about 20 to 25 minutes.