Put the oatmeal and milk in a bowl. If you like, add a little honey if you like it a little sweeter.
Put the flour, baking powder and sugar in a bowl and mix together.
Put the olive oil and egg in a bowl and stir with the whisk until the ingredients are mixed. Puree the bananas and add them. Add the mixture to the flour mixture and mix with a wooden spoon until it is a dough. Add the oatmeal mixture and raisins and mix well again.
Divide into 12 muffin cases, filling 2/3 each. Bake at 180 degrees for about 20 minutes.