Preheat the oven to 375F and grease a 9 x 9-inch square baking dish.
Make the batter:
In a medium mixing bowl, combine oats, baking powder, salt, and pumpkin pie spice.
In a separate large bowl, combine the pumpkin puree, honey, milk, eggs, melted butter, and vanilla extract. Add the oat mixture stir to form a thick oat batter.
Bake:
Pour oatmeal mixture into the baking dish and bake for 35 to 40 minutes until the top is golden and the oat mixture is set.
Remove from oven and allow the mixture to cool slightly before serving.
Serve & store:
Serve this baked oatmeal topped with maple syrup and chopped pecans.
Leftovers can be refrigerated for up to 5 days in an airtight container or the baking dish sealed with plastic wrap.
Notes
You can swap pumpkin pie spice for ½ teaspoon ground cinnamon.