Position a rack in the middle of the oven and heat the oven to 350 degrees F. Lightly butter and flour four mini loaf pans, one 12-cup Bundt pan, or one 9x5-inch metal loaf pan.

Combine the flour, baking powder, baking soda, and salt in a medium mixing bowl. Whisk the ingredients well to combine.

In the bowl of a stand mixer or in a medium mixing bowl, mix the butter on low speed with the stand mixer's paddle attachment or on medium-low speed with a hand mixer until smooth. Add the sugar gradually and continue mixing on low speed until slightly fluffy. Add the eggs one at a time, mixing until smooth between each addition. Add the bananas, scrape down the sides of the bowl, and mix until blended.

Stop the mixer and add half the flour mixture. Mix on low speed (for either mixer) until the flour drifts are almost gone. Add half the buttermilk. Mix until blended, and then repeat with the remaining flour and buttermilk. Continue mixing until smooth, scraping the bowl to make sure the batter is even. Stir in the chocolate chips by hand.

If using mini loaf pans, divide the batter evenly among the four pans (the pans should be about two-thirds full). If using a Bundt or full-size loaf pan, spread the batter in the pan (again, filling the pan no more than two-thirds full.) Smooth the top of the batter. Bake until the loaves are golden and a skewer or toothpick inserted into the center comes out clean, about 40 minutes for mini loaves (60 minutes for a Bundt pan and 60 to 70 minutes for a full-size loaf pan).

Let the loaves cool in the pans on a rack for 10 to 15 minutes to give them time to set and then turn them out onto a rack and flip right side up to cool completely.