In a mixing bowl, I whisk together flour, baking soda, and salt. This ensures the leavening is evenly distributed. I like to set this aside while I focus on the wet ingredients.
In another bowl, I mash the ripe bananas and add melted butter, sugar, egg, vanilla, and Greek yogurt. Mixing these first makes the batter smooth and ensures even moisture throughout.
I gently fold the dry ingredients into the wet mixture. It’s important not to overmix; a few lumps are okay. Then, I carefully fold in the blueberries to prevent them from breaking and turning the batter purple.
I preheat the oven to 350°F (175°C) and line a muffin tin with paper liners. The batter goes into each cup evenly, and I bake for 20-25 minutes. I know they’re ready when a toothpick comes out clean.
Once baked, I let the muffins cool in the tin for 5 minutes, then transfer them to a wire rack. Cooling prevents them from becoming soggy at the bottom. After about 15 minutes, they’re ready to enjoy.