In a mixing bowl, combine the mashed bananas, flour, sugar, baking powder, salt, and cinnamon (if using).

Gradually add the milk and vanilla extract to the mixture, stirring until a smooth batter forms.

Heat vegetable oil in a deep frying pan over medium heat.
Once the oil is hot, drop spoonfuls of the banana batter into the oil, making small fritters. Fry until golden brown on both sides, turning as needed.

Use a slotted spoon to remove the fritters and place them on a plate lined with paper towels to absorb excess oil.