While the casserole is baking, make the muffins. First, grease two 12-cup muffin tins.
In a large mixing bowl, combine eggs, applesauce, vegetable oil (or melted coconut oil), and sugar and mix well.
Add a cup of flour, followed by baking powder and salt.
Next, alternate adding milk and the remaining three cups of flour, being sure not to overload your mixer while mixing together on a low setting.
Fold in the blueberries, taking care to not over-mix as you want to keep the blueberries intact.
Pour into greased muffin tins, filling each about ¾ full.
Turn the oven to 400 degrees and bake for 18-22 minutes, or until done. (Note: It’s fine for the casserole to bake at 400 degrees while the muffins are in the oven).
If you’ve timed it right, the casserole and the muffins will both be finished baking at the same time, haha!