Preheat oven to 300 degrees F. Grease and flour a bundt inch pan. In a small bowl, mix mashed bananas with lemon juice, set aside.
In a large bowl, cream 3/4 cup butter and 2 cups sugar until light and fluffy. Beat in the eggs one at a time, then stir in 2 teaspoons vanilla and buttermilk. Beat in the flour, baking powder and salt. Stir in banana mixture. Pour batter into prepared pan.
Bake in preheated oven for 1 hour, or until a toothpick inserted into the center of the cake comes out clean. Remove from oven and let cool for 20-30 minutes. Overturn cake onto a plate and cool completely before frosting.
For the frosting:
Cream butter and cream cheese until smooth. Beat in 1 teaspoon vanilla.
Add powdered sugar and beat on low speed until combined, then on high until frosting is smooth.
Spread on cooled cake. Top with chopped pecans. Enjoy!
Cake recipe yields a pound-cake like moist banana cake that is rich combined with the cream cheese frosting, hence my suggestion to divide the cake into 20 servings.