Preheat oven to 350 degrees. Grease two 8 1/2 x 4 1/2 inch loaf pans or 4 mini loaf pans. Whisk eggs in a mixing bowl. Add sugar, zucchini, apple, vanilla and oil. Mix well. Combine dry ingredients, add to zucchini mixture. Fold in walnuts. Pour batter into prepared pans. Bake for 45 - 50 minutes or until a knife comes out clean. Cool 10-15 minutes before removing from pan.