Preheat the oven to 375℉ degrees. Grease an 8×8 baking dish with oil.
In a medium bowl, combine oats, pumpkin pie spice, baking powder, and salt. Mix to combine.
Add pumpkin puree, milk, eggs, vanilla, and maple syrup/honey to bowl. Stir to combine.
Spread into the prepared baking dish. Bake for 30-35 minutes. Oatmeal is done baking when it is puffed up on the edges, set in the middle and top is golden.
Let cool for 10 minutes before slicing. It will be soft at first but will firm up as it cools. Enjoy warm topped with yogurt, a splash of milk, a drizzle of honey or maple syrup, fruit, whipped cream or simply on its own.
Let cool completely and store in an air-tight container fridge for up to 4 days.
