Pre-heat oven to 350 degrees F. Line a 12-cup muffin tin with silicone muffin cups. If you don't have silicone cups, you can use paper ones.
Add gluten-free baking flour, coconut flour, salt, baking powder and baking soda to a large mixing bowl. Stir to combine.
In a separate smaller bowl, add maple syrup, eggs, applesauce, milk and vanilla. Use and whisk to combine these wet ingredients.
Add the wet ingredients to the large bowl of dry ingredients. Stir until combined. Then fold in the blueberries.
Divide muffin batter evenly between the 12 muffin cups. Bake in the pre-heated oven for 20-23 minutes or until tops are slightly browned and you can smell them.