Instructions:
Preheat your oven to 400°F (204°C). Prepare a muffin tin by lining it with paper liners and greasing the tops if necessary.
In a large mixing bowl, whisk together the flour, sugar, baking powder, and salt until well combined.
In a separate bowl, mix the oil (or melted butter), egg, milk, and vanilla extract until smooth.
Pour the wet ingredients into the dry ingredients and stir gently until just combined. Be careful not to overmix; the batter should be thick.
Gently fold in the blueberries, making sure they're evenly distributed throughout the batter.
Divide the batter evenly among the muffin cups, filling each about 3/4 full. If desired, sprinkle a little extra sugar on top for added sweetness.
Bake in the preheated oven for 15 to 20 minutes, or until the tops are golden brown and a toothpick inserted in the center comes out clean or with a few crumbs.
Remove the muffins from the oven and allow them to cool in the pan for a few minutes before transferring to a wire rack to cool completely.
For the best results, verify you measure your ingredients accurately and don't overmix the batter, as this can lead to dense muffins. Additionally, using frozen blueberries directly from the freezer can help prevent batter discoloration.
If you want to enhance the blueberry flavor, consider cooking half of the blueberries with a little lemon juice and sugar before folding them into the batter. This will create an even more delicious and vibrant muffin. Enjoy your baking!