Step 1: Preheat your oven to 375°F (190°C) for even baking.
Step 2: Line a muffin tin with parchment paper liners or grease it lightly with oil.
Step 3: In a large mixing bowl, whisk together the dry ingredients: flour, sugar, baking powder, baking soda, and salt.
Step 4: In another bowl, beat together the wet ingredients: eggs, applesauce, milk, vegetable oil, and vanilla extract until smooth.
Step 5: Pour the wet ingredients into the dry ingredients and mix gently until just combined, being careful not to overmix.
Step 6: Gently fold in the blueberries, ensuring they are evenly distributed.
Step 7: Scoop the batter into the muffin tin, filling each cup about two-thirds full.
Step 8: Bake for 18-22 minutes or until a toothpick comes out clean.
Step 9: Let the muffins cool in the tin for 5 minutes, then transfer them to a wire rack.