Preheat the oven to 325ºF. Spray loaf pans with nonstick spray. Sift the flour, sugar, brown sugar, baking soda, salt, baking powder and cinnamon together. In a separate bowl, combine the bananas, yogurt, eggs, butter and vanilla extract. Fold the banana mixture into the flour mixture until just combined. Turn the batter into the prepared loaf pans and bake in the oven for 40 to 50 minutes, until a skewer inserted in the center of each loaf comes out clean.