Step 1: Preheat the Oven

1. Preheat Oven: Preheat your oven to 375°F (190°C). Line a muffin tin with paper liners or grease it lightly.

Step 2: Prepare the Dry Ingredients

1. Combine Dry Ingredients: In a large mixing bowl, whisk together the flour, granulated sugar, baking powder, baking soda, and salt.

Step 3: Mix the Wet Ingredients

1. Combine Wet Ingredients: In a separate bowl, whisk together the vegetable oil, egg, vanilla extract, and milk until well combined.

Step 4: Combine Mixtures

1. Mix Together: Pour the wet ingredients into the dry ingredients and stir until just combined. Be careful not to overmix; the batter should be slightly lumpy.
2. Fold in Blueberries: Gently fold in the blueberries, being careful not to break them.

Step 5: Bake the Muffins

1. Fill Muffin Tin: Divide the batter evenly among the prepared muffin cups, filling each about 2/3 full. If desired, sprinkle a little sugar on top of each muffin for added sweetness and crunch.
2. Bake: Bake in the preheated oven for 20–25 minutes, or until a toothpick inserted into the center comes out clean and the muffins are golden brown.

Step 6: Cool and Serve

1. Cool Slightly: Remove the muffins from the oven and let them cool in the pan for about 5 minutes before transferring them to a wire rack to cool completely.
2. Enjoy: Serve warm or at room temperature. Enjoy your delicious Blueberry Muffins!