Preheat the oven to 400°F (200°C). Line a 12 cup muffin tin with paper liners or grease with nonstick cooking spray. Set aside.
Toss the blueberries in 1 tablespoon of gluten-free flour. Set aside.
In a large bowl, whisk the remaining gluten-free flour blend, granulated sugar, baking powder, baking soda, and salt together. Set aside.
In a medium mixing bowl, add together the milk, eggs, vegetable oil and vanilla extract. Whisk until smooth.
Pour the wet ingredients into the dry ingredients. Mix until combined.
Carefully fold in the blueberries, being sure not to overmix so that the batter does not get dyed with blueberry juices.
Portion out the muffin batter into the prepared muffin tin using a cookie scoop or measuring cup. The muffin cups will be almost filled to the top. Sprinkle the tops with turbinado sugar.
Bake at 400F for 15-17 minutes, until the muffins are browned and cooked through. The tops should spring back when you lightly press on them.
Let the muffins cool for 5 minutes before removing from the muffin tin. Set on a wire rack to finish cooling.
Serve and enjoy!