Mash the bananas finely with a fork.
Add the eggs and oil into a bowl and mix together.
Add the mashed banana, sugar, and vanilla extract and mix again.
Sift in the flour, baking powder, and salt, then gently fold together.
Add the chocolate chips and mix until evenly distributed.
Divide the batter into muffin molds.
Bake in a preheated oven at 180°C (356°F) for 20 minutes.