Preheat oven to 350 degrees F.
Spray 9x11" or 9x13" baking dish with cooking spray.
In large bowl combine oats, flour, flaxseed, baking powder, salt, and spices. Mix well.
In medium bowl, combine milk, coconut oil, maple syrup, molasses, eggs, and vanilla, and whisk well to combine.
Add wet ingredients to dry ingredients and stir with spatula until just combined.
Fold in chocolate chips.
Pour into prepared baking dish.
Bake 35-40 minutes for 8x11" dish or 32-35 minutes for 9x13" dish, until middle is set and top is golden brown.
Let cool.
Cut into squares and enjoy!
*Note: I made these in sort of an odd-sized pan, an 8x11" which made them really thick but you can definitely make them in a regular 9x13" pan, they'll just be a little thinner and won't take quite as long to bake.