Preheat oven to 325 degrees F.
Spray a loaf pan with nonstick cooking spray.
Whisk the flour, baking soda, cinnamon and salt until combined.
In another bowl, mix the egg, sugars, and avocado oil until combined.
Add the milk, vanilla, and mashed bananas and mix well.
Add the dry mixture to the wet mixture and stir until just blended. Don't overmix.
Fold in half the walnuts and half the pecans and pour batter into prepared loaf pan.
Top with remaining walnuts and pecans.
Bake for 60-70 minutes or until a toothpick inserted in center comes out with a few crumbs on it.