In a medium bowl, combine wet ingredients: avocado oil, maple syrup, eggs, ripe bananas, and vanilla extract. Mix well until thoroughly combined.
In a large bowl, mix dry ingredients: flour, baking power, salt, and cinnamon. Combine well.
Add the wet ingredients to the large bowl with dry ingredients and mix until just combined.
Add frozen blueberries and walnuts and gently fold into the batter.
Pour into a lightly oiled loaf pan. Optional: top with a sprinkle of brown sugar, extra walnuts, and blueberries.
Bake for about 50-55 minutes, or until a fork comes out clean. Note: Different ovens may have a slightly different baking time so you may need a few minutes more or less. Let bread cool and then transfer the whole loaf to a cooling rack until ready to slice.
Notes
Nutrition facts are based on one slice of banana bread when the bread is sliced into 8 equal slices.