In large mixing bowl, stir together oats with almond milk. Allow to sit 15-20 minutes, allowing oats to soften and soak up almond milk.
Preheat oven to 375 degrees. Line muffin tin with paper liners or spray with nonstick cooking spray.
In separate bowl, whisk together flour, brown sugar, baking powder, baking soda and salt. Set aside.
To softened oats, add oil, water, vinegar and vanilla. Stir to combine. Add the flour mixture and mix just until batter comes together.
In small bowl, coat blueberries with 1 tablespoon flour blend {this keeps blueberries from sinking while baking}. Add to muffin batter and gently fold in blueberries.
Scoop batter into prepared muffin tin. Bake muffins 22-24 minutes, until golden brown {add 2-4 minutes if using frozen blueberries}.
Cool muffins in pan 10 minutes. Remove muffins from muffin tin and place on cooling rack to cool completely.
Recipe by Sarah Bakes Gluten Free at https://www.sarahbakesgfree.com/2020/05/gluten-free-vegan-blueberry-oatmeal-muffins.html