Preheat Oven: Preheat your oven to 375°F (190°C). Line a muffin tin with paper liners or grease the muffin cups with butter or cooking spray.
Mix Dry Ingredients: In a large mixing bowl, whisk together the flour, sugar, baking powder, baking soda, and salt.
Combine Wet Ingredients: In another bowl, whisk together the melted butter, eggs, yogurt, and vanilla extract until well combined.
Combine Wet and Dry Mixtures: Pour the wet ingredients into the dry ingredients and gently stir until just combined. Be careful not to overmix; a few lumps are okay.
Add Blueberries: Gently fold in the blueberries, being careful not to crush them. If you're using frozen blueberries, you can add them directly from the freezer.
Fill Muffin Cups: Using a scoop or a spoon, divide the muffin batter evenly among the muffin cups, filling each about 2/3 full.
Optional Sugar Topping: If desired, sprinkle a pinch of turbinado sugar on top of each muffin for a sweet, crunchy topping.
Bake: Place the muffin tin in the preheated oven and bake for 18-22 minutes or until the muffins are golden brown on top and a toothpick inserted into the center comes out clean.
Cool: Allow the muffins to cool in the pan for about 5 minutes, then transfer them to a wire rack to cool completely.