Preheat oven to 350°F.
In a bowl, whisk together first 4 ingredients.
In a large bowl, beat sugar and eggs until thick. Stir in oil, bananas, yogurt and vanilla. Fold in flour mix, coconut and walnuts.
Pour into greased 9-by 5-inch pan. Bake for 75 minutes. Let cool on rack and serve.
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