Peel the bananas and mash them with a utensil. Set aside.

In another bowl, combine the margarine, sugar, and vegetable oil. Mix until well combined.

Add one egg and beat, then add the second egg and beat again.

Sift the dry ingredients—flour, baking powder, and cinnamon—over the mixture. Mix well.

Add the mashed bananas and vanilla extract to taste. Mix briefly (I like to leave some banana chunks, but you can mix until smooth if you prefer).

Pour the batter into a prepared baking pan and bake in a preheated oven at 350°F (180°C) for about 30 minutes, or until a knife or toothpick inserted in the center comes out clean.

Let me know how it turns out and send me photos!