Preheat the oven to 350°F (175°C) and line a muffin tray with paper liners.
In a mixing bowl, add the vegetable oil, granulated sugar, vanilla extract and mix until combined.
Add the mashed bananas and mix until combined.
In a separate bowl, whisk together the all-purpose flour, baking soda, baking powder, salt, oats, and cinnamon.
Gradually add the dry ingredients to the wet mixture.
Pour in the milk and mix until just combined. Do not overmix.
Add the chocolate chips and gently fold them into the batter.
Divide the batter evenly among the prepared muffin liners, filling each about three-quarters full.
Bake at 350°F (175°C) for 20–25 minutes, or until a toothpick inserted into the center comes out clean.
Remove the muffins from the oven and allow them to cool for a few minutes.
Serve and enjoy!
