Preheat the oven to 200ºC. Put twelve paper cupcake capsules in a metal muffin tin. With the mixer mash the bananas until pureed, set aside. In a tall jug add the oil and beaten eggs, mix everything well.
In a bowl sift the flour, add the sugar, the sachets of raising agent or the chemical yeast and bicarbonate. Add the beaten egg mixture and oil, as well as the banana puree. ** Mix well ** all the ingredients until they form a somewhat thick dough.
Add the chocolate chips and spread over the entire mass so that they are not lumpy. Distribute the mixture in the muffin capsules and bake for 20 minutes.