Preheat the oven to 350F and spray a 9x5-inch loaf pan with nonstick cocking spray. Line it with parchment paper and set aside.
In a large bowl, whisk together the gluten-free flour blend, xanthan gum (if using), baking powder, salt, cinnamon and granulated sugar until combined.
Gently stir in the fresh blueberries. Set aside.
In a medium bowl, whisk together the eggs, coconut milk, brown sugar, avocado oil and vanilla extract until combined.
Pour the wet ingredients into the dry ingredients and carefully stir until just combined.
Pour the batter into the prepared baking pan.
Sprinkle the top with raw sugar.
Bake at 350F for 55 to 65 minutes, until a toothpick inserted into the center comes out clean.
Cool the quick bread in the pan for 20 minutes and then remove form the pan and cool completely on a wire rack.