Preheat the oven to 350°F. Coat an 8×8-inch baking dish with nonstick cooking spray.
In a large bowl, stir together the oats, baking powder, pumpkin pie spice, cinnamon and salt.
In a separate bowl, whisk together the eggs, pumpkin purée, milk, maple syrup, melted coconut oil or butter, and vanilla until smooth.
Pour the wet ingredients into the oat mixture and stir until combined. Fold in the pecans.
Transfer to the prepared baking dish and spread evenly. Top with additional pecans, if desired. Bake for 32 to 38 minutes, until the center is set and the edges are lightly golden.
Whisk the softened cream cheese with the maple syrup, 1 tablespoon of milk and pumpkin pie spice until smooth. Add the remaining milk as needed to thin the glaze.
Let the oatmeal cool for 5 to 10 minutes before slicing. Drizzle with the glaze and serve warm.