Preheat oven to 350F. Line a 12-cup muffin tin with paper liners.
In a stand mixer fitted with a paddle attachment, beat eggs and butter until combined. Beat in applesauce, honey, vanilla, apple cider vinegar, coconut flour, baking soda, and salt until almost no lumps remain. Gently fold in blueberries.
Fill each muffin cup about ⅔s full.
Bake 17 - 20 minutes or until a toothpick inserted into the center comes out clean.Transfer to a wire rack to cool.