Preheat the oven to 180°C (350°F). Grease and line a 20x12cm (8x5in) loaf tin.
Cream the butter and sugar: In a large mixing bowl, beat the softened butter and the sugar until light and fluffy. This will take about 3-5 minutes.
Add the eggs: Crack the eggs into the bowl one at a time, beating well after each addition.
Mash the bananas: Peel and mash the ripe bananas with a fork until smooth. Add the mashed bananas to the butter-sugar mixture and stir to combine.
Mix the dry ingredients: In a separate bowl, sift the flour, baking soda, baking powder, and sea salt together. Gradually fold the dry ingredients into the wet ingredients until just combined.
Add the chocolate chips: Gently fold in the chocolate chips, ensuring they are evenly distributed throughout the batter.
Transfer the batter to the tin: Pour the banana bread batter into the prepared loaf tin and smooth the top.
Bake: Place the tin in the preheated oven and bake for 50-60 minutes, or until a toothpick inserted into the center comes out clean.
Cool: Once baked, remove the loaf from the oven and let it cool in the tin for 10 minutes before transferring it to a wire rack to cool completely.