Preheat the oven to 350 degrees F. Spray two 9 x 5-inch bread loaf pans with cooking spray or line with paper liners. (This makes cleanup very easy)
In a large mixing bowl, using an electric hand mixer, whisk or wooden spoon, mash the bananas and incorporate with the sugar and brown sugar.
Add the zucchini, eggs, oil and vanilla extract to the mixture and combine. Add the flour, baking soda, baking powder, salt, cinnamon and nutmeg, stirring to combine.
Once mixed thoroughly, fold in the pecans.
Divide batter evenly into two prepared (9x5-inch) loaf pans. Place the baking pans on a half sheet pan, lined with parchment paper. (This helps catch any dropped batter and helps easily rotate pans.)
Rotate your breads once through the baking process, so they bake evenly. Carefully rotate the entire half sheet pan 180-degrees about three quarters through the baking process. (Be very careful not to bump the pans or your bread will fall!!)
Bake for 55-60 minutes, or until a toothpick when inserted comes out mostly clean with a few moist crumbs.
Remove loaves from the oven. Let cool in the baking pans for 10-15 minutes. Turn out of baking pans, place banana breads on a wire cooling rack to cool completely.
Once cooled, package into plastic bread bags with a twist tie.
Banana zucchini bread can be stored on the kitchen counter for several days. Refrigerate if super warm in the house. It can be frozen for 1-2 months.