Preheat oven to 350℉ and prepare a loaf pan by greasing or lining it with parchment paper.
In a large mixing bowl, combine mashed bananas, plain Greek yogurt, oil, eggs and vanilla extract. Mix thoroughly.
In a separate mixing bowl, combine flour, sugar, baking powder, baking soda, cinnamon and salt.
Add the dry ingredients to the wet ingredients and stir in the chopped macadamia nuts. Mix well.
Pour the batter into the loaf pan. Bake for approximately 40-60 minutes or until an inserted toothpick comes out clean.
Let the loaf cool for 5-10 minutes before enjoying!