Preheat the oven to 180 °C.
Peel bananas, mash with a fork and whisk with sugar and oil until frothy.
Add flour, baking powder and salt and whisk well for 2 minutes.
Mix in the raisins and pour the batter into the muffin cups.
Bake the muffins for about 25 minutes.
Preparation Tip:
If you don't like raisins, leave them out. Mix chopped nuts or chocolate drops into the dough, this makes them even more tempting.