Preheat your oven to 350°F (175°C) and line a muffin tin with paper liners.
In a large mixing bowl, mash the ripe bananas until smooth.
Add the Greek yogurt and honey (or maple syrup) to the bananas and mix well.
Beat in the eggs until fully incorporated.
In a separate bowl, combine the rolled oats, protein powder, baking powder, baking soda, cinnamon, and salt.
Gradually add the dry ingredients to the wet ingredients, stirring until just combined.
Spoon the batter into the prepared muffin tin, filling each cup about 2/3 full.
Bake in the preheated oven for 18-20 minutes, or until a toothpick comes out clean.
Allow the muffins to cool in the tin for 5 minutes, then transfer to a wire rack to cool completely.
Enjoy your delicious banana protein muffins as a healthy snack or breakfast option!