Prepare the Oven and Muffin Tin
Preheat your oven to 375°F (190°C). Line a 12-cup muffin tin with paper liners, or lightly grease each cup if not using liners.
Mix Dry Ingredients
In a large mixing bowl, whisk together the flour, sugar, baking powder, and salt. Add the lemon zest and mix until evenly distributed. This helps release the lemon’s essential oils into the dry ingredients, enhancing the flavor.
Combine Wet Ingredients
In a separate bowl, whisk together the egg, milk, yogurt, oil, and vanilla extract until smooth.
Bring the Batter Together
Pour the wet ingredients into the bowl with the dry ingredients. Gently fold the mixture until just combined—overmixing can make the muffins dense.
Add the Blueberries
Gently fold in the blueberries, taking care not to crush them. This will help keep the batter light and prevent the berries from turning the muffins purple.
Fill and Top Muffin Cups
Divide the batter evenly among the muffin cups, filling each about ¾ full. For a bakery-style touch, sprinkle a little coarse sugar on top of each muffin for a crunchy topping.
Bake the Muffins
Bake for 18-22 minutes, or until a toothpick inserted into the center comes out clean or with a few moist crumbs. The tops should be golden and spring back slightly when touched.