Preheat oven to 350°F
Butter all sides of the loaf pan or you can use parchment paper to line the pan.
Mash the bananas then in a large mixing bowl add the dry ingredients and the eggs, and mix with a spatula until well combined. Stir in the melted butter until fully incorporated.
Pour the batter in the prepared pan, filling it to 3/4 inch (2 cm) from the top (you may have extra batter). Bake until the cake is golden brown (about 1 hour) and a knife comes out clean.
Let the cake cool in the pan for 15 minutes. While the cake is still warm, turn it out of the pan. Slice and enjoy while the cake is still warm!