Preheat the oven to 350 degrees Fahrenheit. Grease a 9x5 metal loaf pan with cooking spray, and set it aside.
If making homemade buttermilk, add 1 tablespoon of lemon juice to a liquid measuring cup. Then, fill the cup with milk until it reaches the 1 cup mark. Whisk to combine, and set the mixture aside to curdle.
In a large bowl, cream the softened butter, sugar, and beaten eggs until well combined.
1/2 cup softened butter, 1 cup granulated sugar, 2 eggs, beaten
Fold in the mashed bananas.
3 very ripe bananas, mashed (see notes)
In a medium-sized mixing bowl, whisk the flour, baking soda, and salt until well combined.
2 cups flour, 1 teaspoon baking soda, 1/4 teaspoon salt
In small batches, alternatively add the dry ingredients and buttermilk to the banana mixture. Gently mix until the batter is combined. Be careful to not overmix!
1 cup buttermilk
Pour the batter into the greased pan, and bake at 350 degrees for 1 hour or until a toothpick inserted into the middle of the bread comes out clean. If the bread is darkening too quickly, place a piece of aluminum foil on the top while baking.
Allow the bread to cool before slicing. Store at room temperature in an airtight container for up to 3 days, 1 week in the fridge, or 3 months in the freezer.
Video
Notes
Prep Tips - Use 3 medium-sized bananas or 2 large bananas. If using frozen bananas, discard as much of the liquid as possible after defrosting. Baking Tips - If the bread is browning too much while baking, loosely tent or place a piece of aluminum foil on top. Storage Tips - This bread freezes well as a whole loaf or in slices. Wrap the loaf or slices in plastic wrap then place in a freezer storage bag in the freezer for up to 3 months.