Preheat your oven to 350°F (175°C) and line a muffin tin with paper liners or grease it with a bit of coconut oil.
Mix the dry ingredients. In a large bowl, whisk together the gluten-free flour, baking powder, baking soda, and salt. Set aside.
Blend the wet ingredients. In another bowl, whisk the eggs, applesauce, honey (or maple syrup), melted coconut oil, vanilla extract, lemon zest, and lemon juice until well combined.
Combine the wet and dry ingredients. Gradually add the wet ingredients to the dry ingredients, stirring gently to avoid overmixing. The batter should be thick but moist.
Fold in the blueberries. Gently fold in the blueberries, being careful not to crush them, especially if they’re frozen.
Fill the muffin cups. Spoon the batter evenly into the muffin tin, filling each cup about 2/3 full.
Bake and enjoy. Bake for 18-22 minutes, or until a toothpick inserted into the center comes out clean. Let the muffins cool in the pan for a few minutes, then transfer them to a wire rack to cool completely.