Preheat oven to 350F. Prepare 12 cups of a muffin pan by spraying with non-stick cooking spray or lining with paper muffin cups; set aside.

In a large mixing bowl, cream together the butter and sugar with an electric mixer until light and fluffy.

Add the eggs and mix until incorporates (the batter may seem chunky at this point).

Next, stir in the mashed bananas and vanilla extract.

In a small mixing bowl, whisk together the flour, baking soda, and salt. Pour the dry mixture into the wet and stir until combined.

Fold in the chocolate chips.

Scoop the batter into the prepared muffin cups, filling them to the top.

Bake the muffins at 350F for 28-35 minutes.

Cool the muffins in the pan for 5 minutes, then remove and cool on a wire cooling rack.