Preheat the Oven: Begin by preheating your oven to 375°F (190°C). Prepare your muffin tin by lining it with paper liners or greasing it generously with cooking spray or butter.
Combine Dry Ingredients: In a large mixing bowl, whisk together the all-purpose flour, granulated sugar, baking powder, baking soda, and salt. Ensure these dry ingredients are well blended to promote even rising.
Mix Wet Ingredients: In a separate medium bowl, mix the buttermilk (or plain yogurt), melted unsalted butter, large eggs, and vanilla extract. Stir until the mixture is smooth and fully combined. If you're using lemon zest, add it to this mixture to enhance the flavor profile.
Combine Wet and Dry Mixtures: Pour the wet ingredients into the bowl containing the dry ingredients. Using a spatula, gently fold the mixtures together until just combined. Remember, it's perfectly fine to have a few lumps in the batter; overmixing can lead to tough muffins.
Add the Blueberries: Carefully incorporate the blueberries by folding them into the batter, ensuring they are evenly spread throughout without crushing them.
Fill the Muffin Tin: Use a spoon or an ice cream scoop to evenly distribute the muffin batter into the prepared muffin tin, filling each cup about 3/4 full for perfectly domed muffins.
Add Sugar Topping: To create a delightful crunch, sprinkle a little coarse sugar evenly over the tops of each muffin before baking.
Bake: Place the muffin tin in the preheated oven and bake for 20-25 minutes. The muffins are done when the tops are golden brown and a toothpick inserted in the center comes out clean.
Cool Down: Once baked, allow the muffins to cool in the pan for approximately 5 minutes. Then, transfer them to a wire rack to cool completely and let the texture settle.
Notes
For serving, arrange the warm muffins on a beautiful platter. Dust them lightly with additional sugar on top, and consider garnishing with a few fresh blueberries around the muffins for a vibrant touch!