Preheat the oven to 375 degrees F
Sift and mix dry ingredients together in a mixing bowl.
Add room temperature butter, eggs, buttermilk, and 1/2 cup of mashed bananas to the mixing bowl with dry ingredients. Beat at a low speed for 2 minutes.
Now add the remaining 1 cup of mashed bananas and vanilla extract to the mixing bowl. Beat 1 minute.
Grease and flour three 8-inch round cake pans.
Divide the cake batter evenly among the three cake pans.
Bake 20 to 25 minutes.
Let the cakes cool in the round pans for 5 minutes. Next, remove the cakes from the pans and let them cool completely on wire racks.
Beat the ingredients for the cream cheese frosting together in a mixer until smooth.
Assemble the cake (refer to assembling layer cake step in the article). Make sure frosting is at room temperature before assembling the cake.