Grandma Hazel's Banana Bread

1/3 cup oil
1 cup sugar
3 large bananas, mashed
1 egg
2 cups flour
1/2 teaspoon baking soda
2 teaspoons baking powder
1/4 teaspoon salt
1 cup chopped nuts

Combine sugar, oil, and bananas and beat well. Add eggs and beat well. Add remaining ingredients. Do not over beat. Bake at 325° for 1 hour in a 9x5 inch greased loaf pan.