In a large mixing bowl, put the crushed banana, add sugar, and egg. Mix well.
Now, pour in the milk, add flour, and baking soda. Mix well.
Brush the rectangular baking dish with oil. Then fill it with the banana bread mixture.
Preheat oven to 350 degrees F.
Bake the mixture for 1 hour.
After 1 hour, make slices. Serve and enjoy!