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Preheat oven to 275°. Grease and flour a 9 x 13 pan.
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In a small bowl, mix mashed banana with the lemon juice; set aside.
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In a medium bowl, mix the flour, baking soda and salt; set aside.
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In a large bowl, cream the 3/4 cup butter and 2 1/8 cups sugar until light and fluffy. Beat in the eggs, one at a time, then stir in 2 tsp vanilla. Beat in the flour mixture alternately with the buttermilk. Stir in the banana mixture.
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Pour the batter into prepared pan and bake in preheated oven for one hour or until toothpick inserted in center comes out clean. Remove from the oven and place directly into the freezer for 45 minutes. This will make the cake very moist.
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For the frosting, cream the butter and cream cheese until smooth. Beat in 1 teaspoon vanilla. Add the icing sugar and beat on low speed until combined, then on high speed until frosting is smooth.
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Spread on cooled cake.