Preheat oven to 375 degrees. Grease/spray a 9x13 pan.
Mix together dry ingredients (oats, brown sugar, flax meal, baking soda, baking powder, salt, cinnamon and nutmeg) in a large bowl.
Mix together the wet ingredients (eggs, milk, butter, applesauce) in a smaller bowl.
Add the wet ingredients to the dry ingredients. Combine until the entire mixture is wet.
Add the chopped apples and peaches to the mixture. Once combined, gently add the blueberries.
Place mixture into your greased 9x13 dish. Bake for 30 minutes and then turn 180 degrees for even baking.
Bake another 15-30 minutes, until the top and edges turn brown, and a knife inserted in the middle comes out almost clean.