Preheat your oven to 350°F (175°C) and lightly grease an 8x8-inch baking dish with a small amount of coconut oil or non-stick cooking spray.
Prepare the flax egg by whisking together 2 tablespoons of ground flaxseed and 6 tablespoons of water in a small bowl. Set aside for 5-10 minutes until it develops a gel-like consistency.
In a large mixing bowl, whisk together the sprouted rolled oats, pumpkin pie spice, baking powder, and sea salt until well combined.
Add the pumpkin puree, almond milk, pure maple syrup, vanilla extract, and the prepared flax egg to the dry ingredients.
Stir the mixture thoroughly with a spatula until all the oats are well coated and the liquid is evenly distributed.
Transfer the oatmeal mixture into the prepared baking dish, smoothing the top into an even layer.
Sprinkle the chopped pecans evenly over the top of the mixture.
Place the dish in the center of the oven and bake for 40 to 45 minutes. The oatmeal is done when the center is firm to the touch and the edges are slightly golden brown.
Remove from the oven and allow the baked oatmeal to cool for at least 10 minutes before slicing into 6 squares. Serve warm.