Ensure to preheat your conventional oven to 350 degrees Fahrenheit. After that, grease and dust 3 8" pans. Then, line them with circular parchment.
Afterward, add the dry ingredients; sugar, flour, baking soda, baking powder, and salt to a mixing bowl. And blend using an electric mixer for 30 seconds to combine.
Then, gradually put the softened butter to the dry ingredients. And set your mixer to low speed until the dry ingredients are moist. After that, mix until you achieve a coarse sand texture. Afterward, scrape the bowl's sides and bottom to incorporate well.
Next, in a different bowl, slice and mash the bananas. And then, add lemon juice, eggs, vanilla, and buttermilk. Afterward, mix it lightly using a fork to blend.
After that, add the first half of the banana mixture to the dry ingredients. So with that, set the mixer at low or medium speed for a minute. Afterward, please ensure to scrape the bowl's bottom and sides and then beat for another minute.
Then, pour the cake batter onto the cake pans and bake for 25-30 minutes.
Finally, let the banana cakes cool for about 5 to 10 minutes on the cooling rack. Then, turn the banana cakes out, and cool completely.