Preheat oven to 350 degrees F.
In a food processor or a bowl, add eggs and beat. Add mashed banana. Add olive oil. Mix.
In a separate bowl mix together the almond flour, baking soda, and stevia.
Combine the two mixtures together until well blended. Toss in the walnuts.
Spray/grease the loaf pan with coconut oil and pour batter. You may also use parchment paper if you don't like greasing your pan.
Bake for 45-60 minutes. Use a tester or a toothpick, if it comes out clean then it's baked well. If making muffins, bake for 15-20 minutes.
