In a large bowl, cream butter and sugar. Add eggs, one at a time, beating well after each addition. Stir in vanilla. Combine flour, baking soda and salt; add to creamed mixture, beating until combined. Fold in banana and pecans.
Pour into a greased 8-inch square baking dish. Bake at 350 degrees for 30–35 minutes or until a toothpick inserted near the center comes out clean. Cool.
In a bowl, cream butter. Beat in the milk, vanilla, salt and enough confectioners’ sugar to achieve spreading consistency. Stir in toasted pecans. Frost cake. Garnish with pecans if desired.
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