Preheat the oven to 400 degrees F (200 degrees C). Line a muffin pan with paper liners.
Combine muffin mix, mashed bananas, and water in a medium bowl. Mix well. Stir in chocolate chips.
Pour batter into the prepared muffin cups.
Bake in the preheated oven until a toothpick inserted into the center comes out clean, about 18 minutes. Cool in the pan for 10 minutes. Transfer to a wire rack to cool completely.
