1. Preheat oven to 350.
2. Lightly spoon flour into dry measuring cup; level with a knife. Combine the flour, baking soda, and salt, stirring with a whisk.
3. Place sugar and butter in a large bowl, and beat with a mixer at medium speed until well blended, about 1 minute. Add the eggs, one at a time, beating well after each addition. Add banana, yogurt, and vanilla; beat until blended. Add flour mixture; beat at low speed just until moist. Pour batter into 8 1/2 x 4 1/2 loaf pan coated with cooking spray. Bake at 350 for 1 hour or until a wooden pick inserted in the center comes out clean. Cool 10 minutes in the pan on wire rack; remove from pan. Slice and serve.
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