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Mix the ingredients: Add the oats, milk, applesauce, walnuts, eggs, maple syrup, vanilla, cinnamon, baking powder and salt to a large bowl. Mix well.
Layer in a casserole dish: Lightly grease a 7x11 inch rectangular baking dish. Spread half the oat mixture in the bottom of the dish. Sprinkle with about 3/4 of the blueberries. Top with the remaining oat mixture, carefully smoothing the top. Sprinkle on the remaining blueberries. You can also sprinkle on some extra walnuts if you like!
Chill the dish: Cover the casserole dish and chill in the refrigerator overnight (see notes for instructions to bake right away)
Bake the dish: The next morning, remove the dish from the fridge. Preheat the oven to 350°F. Bake until set and golden on top, about 30-35 minutes. Rest for 5 minutes on a rack on the counter, then slice and serve warm.