Preheat the oven to 350F. Line a muffin pan with baking cups or coat the cups with nonstick cooking spray.
In a large bowl, whisk together the flour, sugar, brown sugar, baking soda and salt.
In a separate medium bowl, whisk together the mashed bananas, eggs, Greek yogurt, olive oil and vanilla extract. Add the wet ingredients to the dry ingredients and stir until combined. Stir in the chopped nuts or chocolate chips.
Fill the muffin pan cups 2/3 full.
Bake the muffins until a toothpick inserted comes out clean, 18 to 22 minutes.
Remove the muffins from the oven and allow them to cool for 10 minutes in the pan then remove and serve.