Preheat the oven to 350 degrees F.
Line a 12-count muffin tin with cupcake liners.
Sift the flour, baking soda and salt into a medium bowl.
Whisk the vanilla and eggs together in a liquid measuring cup with a spout. Set aside.
In a stand mixer fitted with the paddle attachment or with an electric hand-held mixer, cream the sugar and butter until light and fluffy.
Gradually pour in the egg mixture while beating; beat until incorporated.
Mix in the bananas (the batter will appear curdled, but don't worry), then remove the bowl from the mixer.
With a rubber spatula, fold in the flour mixture until just incorporated.
Fold in the chocolate chips.