Preheat oven to 350°F and prepare a 9-inch loaf pan by lining it with parchment paper and greasing it.
In a large bowl, whisk together the dry ingredients: flour, sugar, brown sugar, baking soda, and salt.
In a separate medium bowl, whisk together the mashed bananas, eggs, Greek yogurt, vegetable oil, and vanilla extract.
Combine the wet and dry ingredients, then stir in your choice of chopped nuts or chocolate chips and pour the batter into the prepared loaf pan.
Bake for 50-60 minutes, or until a toothpick inserted into the center comes out clean.
Let the bread cool completely in the pan before lifting it out with the parchment paper to slice and serve.
