Preheat your oven to 375°F (190°C).
Line your muffin tin with paper liners or grease each cup with coconut oil.
In a large mixing bowl, whisk together the whole wheat flour, salt, baking powder, and baking soda until well combined.
In a separate bowl, combine the eggs, vanilla extract, melted coconut oil, maple syrup, and applesauce. Whisk until smooth.
Pour the wet mixture into the dry ingredients and stir gently until just combined.
Gently fold in the blueberries, ensuring they are evenly distributed.
Spoon the batter into the muffin cups, filling each about 2/3 full.
Bake for 18-20 minutes or until a toothpick inserted comes out clean.
Let the muffins cool in the tin for 5 minutes before transferring to a wire rack.