Preheat your oven to 350℉ / 177℃
In a medium bowl, add the Flour, Baking soda, and salt. Whisk until evenly combined.
In another medium/large bowl, add the Sugar, Vegetable oil, Oat milk, Lemon zest, Lemon Juice, and Vanilla extract. Whisk until evenly combined
Now pour the dry flour mixture into the wet and combine with a rubber spatula.
Add the blueberries into the batter and fold in, being careful not to smash the berries.
Prepare your muffin pans with 12-14 muffin cups, parchment papers, or if you don't want the paper, then just a light coating of oil will do.
Now fill the tins each with ¼ cup of the batter until you have no more batter.
Now top them with a generous sprinkling of granulated sugar.
Set the filled muffin pans on the middle rack of your oven, and bake for 25-30 minutes or until you've achieved a lightly golden exterior.
Remove them from the oven and allow them to rest for no less than 10 minutes before eating.
Enjoy!