Prehead oven to 375 degrees Fahrenheit.
Sift flour, baking powder, soda, and salt into a large mixing bowl.
In a separate bowl, whisk together eggs, oil, brown sugar and applesauce; add to dry ingredients and mix until just blended.
Flood wild blueberries into batter and pour into muffin tins. Filling 2/3 full. Sprinkle tops with brown sugar and bake for 20-25 minutes, until they are lightly browned and a toothpick is inserted into the center comes out clean.