1. Preheat oven to 375 degrees Fahrenheit (190 degrees Celsius).
2. Beat together margarine, oil, and sugars until pale and fluffy. Add the flours, salt, baking soda, egg, vanilla, banana, oats, and cinnamon. Fold in the chopped dates and chocolate chunks.
3. Line two baking sheets with Gefen Parchment Paper and scoop out the batter, leaving at least two inches (five centimeters) between each cookie. Bake 12–13 minutes. Remove to a wire rack to cool.