Best Banana Bread Cake

Ingredients: 3 fresh bananas, mashed 2 tsp. lemon juice 3 C. all-purpose flour 1.5 tsp. baking soda 1/4 tsp. salt 3/4 C. butter, at room temperature 2 C. sugar 3 eggs 2 tsp. vanilla 1 1/2 C. low fat buttermilk