Preheat your oven to 300°F (150°C) and prepare two 9×5-inch loaf pans by buttering and lining with parchment paper.

In a medium bowl, whisk together flour, salt, baking powder, and baking soda. If using, toss in pecans.

In a larger bowl, cream together softened butter and sugar until light and fluffy, about 3-5 minutes. Add eggs one at a time, mixing well after each addition.

Gently incorporate mashed bananas into the mixture until smooth.

Gradually add dry ingredients alternately with buttermilk until just combined. Avoid overmixing.

Divide the batter between prepared loaf pans and smooth the tops.

Bake for about 1 hour, checking for doneness with a toothpick.

Allow to cool in the pans for 10 minutes, then remove and cool completely on a wire rack.