In a second bowl, mix eggs, sugar, milk, yogurt, and oil
2 eggs, 150 g sugar, 1 cup milk, 1/3 cup oil, 1/4 cup natural yogurt
Add the wet ingredients to the dry ones and mix - if the batter is too thick, you can add a little more milk.
Add the chopped chocolate and mix.
200 g chocolate
Spoon the batter into muffin molds.
Bake at 220 degrees (top/bottom heat) for 5 minutes, then reduce the temperature to 180 degrees (top/bottom heat) and bake for about 15-20 minutes - until a skewer comes out clean.