In a large mixing bowl, make pancake mix by mixing together pancake mix and water
Cook pancakes over a greased skillet per instructions on box
Once pancakes are all done, slice each in half
Grease an 11×7 baking dish (or similar) and stand pancake halves, cut side down in 3 rows starting at one short end of prepared baking dish, filling dish completely
Whisk together milk, eggs, vanilla and cinnamon then evenly pour across pancakes
Cover and refrigerate for 4 hours up to overnight (you can also skip this and bake too)
When ready to cook, preheat oven to 350 degrees F and sprinkle chocolate chips across casserole and bake in oven for 40-45 minutes
Allow the pancake casserole to cool for a few then serve while warm with maple syrup!