1. In a large bowl, beat the eggs + sugar vigorously until the mixture turns white. Add the natural yogurt and mix. Add the dry ingredients (flour + chemical booster) to the preparation and mix. Add the melted butter.
2. Divide the dough into two different bowls. In one of them, add the cocoa powder and mix well.
3. In the other bowl, add the vanilla and mix well.
4. Using a few tablespoons, pour the two masses into the muffin tin, inserting them randomly.
5. When we have put all the dough in the mold, with a wooden skewer or the tip of a knife, mix the two masses a little, without mixing too much so that it does not disintegrate.
6. In an oven preheated to 180°C, we will bake our muffins for 15 minutes.
7. Once cooked, let them cool completely (preferably on a rack).
