How to Make It
Lightly coat an 8-inch square (2-quart) baking dish with cooking spray. Whisk together eggs, milk, vanilla, apple pie spice, salt, 1/2 cup of the brown sugar, and 5 tablespoons of the melted butter in a large bowl. Add apple cubes, 3 cups of the oats, 1/2 cup of the pecans, and 1/2 cup of the cranberries; stir to combine. Pour mixture into prepared baking dish; cover with plastic wrap.
Stir together remaining 1/4 cup brown sugar, 3 tablespoons melted butter, 1/2 cup oats, and 1/2 cup pecans in a medium bowl. Cover with plastic wrap. Place covered baking dish and covered bowl in refrigerator; chill 8 hours or overnight.
Preheat oven to 350°F. While oven preheats, remove baking dish and bowl from refrigerator; remove plastic wrap. Stir apple-oat mixture in baking dish to redistribute wet ingredients. Sprinkle top evenly with oat-pecan topping mixture.
Bake in preheated oven until mixture is set in the middle and topping is golden brown, about 35 minutes. Remove from oven, and sprinkle with remaining 1/2 cup dried cranberries. Cool 10 minutes. Serve warm.