Preheat & Prep: Preheat oven to 350°F (175°C). Line a 12-cup muffin tray with paper liners or lightly grease.
Mash Bananas: In a large bowl, mash the ripe bananas until smooth.
Mix Wet Ingredients: Add honey, Greek yogurt, egg, and vanilla extract. Whisk until combined.
Combine Dry Ingredients: In another bowl, mix oats, flour, baking soda, cinnamon, and salt.
Mix Batter: Slowly add dry ingredients to wet mixture. Stir gently; do not overmix.
Fill Muffin Cups: Spoon batter into muffin cups, about ¾ full.
Bake: Bake for 18–22 minutes or until a toothpick comes out clean.
Cool: Let muffins cool on a wire rack for 5 minutes. Serve warm or store.