Preheat the oven to 350°F. Grease a muffin pan or line it with paper liners.
Add the ripe bananas to a large mixing bowl and mash thoroughly with a fork or potato masher.
Add the Greek yogurt, brown sugar, eggs, olive oil, and vanilla extract to the mashed bananas. Stir until smooth and well combined.
Add the white whole wheat flour, baking soda, and salt to the wet ingredients. Stir gently until just combined. Avoid overmixing.
Fold in the mini chocolate chips or other mix-ins if using.
Scoop the batter evenly into the prepared muffin pan using a cookie scoop or spoon.
Bake the Greek Yogurt Banana Muffins for 22–25 minutes, or until the tops are golden and spring back lightly when touched.
Allow the muffins to cool in the pan for 5–10 minutes before transferring them to a wire rack.
Serve warm or at room temperature.