Preheat your oven to 350 degrees F. Spray a 1.5 quart baking dish with cooking spray, set aside.
In a medium bowl, combine the rolled oats, cinnamon, ginger, clove, nutmeg, baking powder, and salt. Stir together to combine.
Add the pumpkin puree, milk, eggs, melted butter, vanilla, and maple syrup to the bowl. Stir until well mixed.
Pour the mixture into the prepared baking dish. Bake for 35 to 40 minutes, until edges are turning golden brown and center is set.
Remove from oven and allow to cool for at least 10 to 15 minutes before slicing into squares and serving.
Leftovers can be stored in an airtight container in the fridge for up to 3 days.