Preheat the oven to 425°F (218°C). Line a muffin tin with cupcake liners and set it aside.
In a medium bowl, whisk together the flour, baking soda, baking powder, and salt.
In a large bowl, add the banana and mash it with a fork until smooth.
Add the sugar, Greek yogurt, oil, and vanilla extract to the mashed banana and mix well.
Add the eggs one at a time, whisking until just combined.
Gradually add the dry ingredients into the wet mixture, stirring until just combined.
Gently fold in the chocolate chunks, being careful not to overmix.
Divide the batter evenly into the muffin cups, filling each almost to the top.
Place the muffin tray in the oven and bake at 425°F (218°C) for 5 minutes. Then, reduce the oven temperature to 350°F (177°C) and bake for an additional 13–15 minutes, or until a toothpick inserted in the center comes out clean.
Allow the muffins to cool in the pan for 5 minutes, then transfer them to a wire rack to cool completely.
Enjoy warm or store in an airtight container for up to 3 days.