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Preheat oven to 325 degrees F.
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Grease and flour a 9x13 inch pan.
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In a small bowl, mix mashed bananas with lemon juice, set aside.
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In a medium bowl, mix flour, baking soda and salt.
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Set aside.
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In a large bowl, cream 3/4 cup butter and 2 1/8 cups sugar until light and fluffy.
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Beat in the eggs one at a time, then stir in 2 teaspoons vanilla.
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Beat in the flour mixture alternately with the buttermilk.
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Stir in banana mixture.
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Pour batter into prepared pan.
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Bake in preheated oven for 1 hour, or until a toothpick inserted into the center of the cake comes out clean.
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For the frosting: In a large bowl, cream 1/2 cup butter and cream cheese until smooth.
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Beat in 1 teaspoon vanilla.
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Add confectioners sugar and beat on low speed until combined, then on high until frosting is smooth.
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Spread on cooled cake.
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You can add walnuts or pecans to the cake or sprinkle them on top of the frosting.