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Preheat oven to 350 degrees.
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In medium bowl, beat butter and sugar until well mixed. Add eggs, vanilla, mashed banana and yogurt. Beat well.
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In separate bowl, stir together flour, baking powder and baking soda.
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Stir together flour mixture with banana mixture, just until combined.
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Pour batter into greased 8"x8' square pan.
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Stir together chopped pecans, brown sugar and cinnamon.
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Sprinkle over top of cake batter.
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Bake 40-45 minutes or until toothpick inserted in center comes out clean.
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Cool for at least 15 minutes before serving.