Preheat oven to 350°F (180°C). Grease 9 x 5-in. (1.9 L) loaf pan. In large bowl, combine flours, baking powder, cinnamon and salt. Set aside.
In separate bowl, whisk together eggs, yogourt, brown sugar, vegetable oil and vanilla. Pour over flour mixture and mix until just combined. Fold in zucchini, pumpkin seeds, walnuts and flaxseeds.
Scrape batter into prepared loaf pan, smoothing top. Bake in centre of oven 55 min. to 1 hr., or until top of loaf is golden brown and skewer inserted into centre comes out clean. Cool loaf in pan 15 min. before turning out onto cooling rack to cool completely.
Substitute an equal amount of grated carrots for zucchini.