Set the oven temperature to 340°F (171°C) and allow it to preheat fully before baking the granola.
Place the rolled oats, pecans, pumpkin seeds, pumpkin pie spice, sugar, and sea salt in a large mixing bowl. Stir thoroughly until the ingredients are evenly distributed.
Add the melted coconut oil, maple syrup, and pumpkin purée to a small saucepan. Warm the mixture over medium-low heat, whisking until smooth and completely blended.
Pour the warm pumpkin mixture over the combined dry ingredients. Working promptly, stir everything together with a wooden spoon until the oats, nuts, and seeds are uniformly coated.
Divide the granola evenly between two baking sheets and spread it into an even layer. If two baking sheets are not available, prepare the granola in two separate batches.
Bake for 23–33 minutes. For evenly cooked granola with a looser texture, gently stir the mixture around the midpoint of the baking period.
For larger, more defined granola clusters, leave the mixture undisturbed and rotate the baking sheets halfway through baking instead of stirring.
When the granola develops a golden-brown color, typically at approximately the 25-minute mark, remove the baking sheets from the oven.
Allow the granola to cool completely on the pans. It will continue to firm and become crisp as its temperature drops.
Once fully cooled, transfer the granola to an airtight storage container. Properly stored, it should remain fresh for approximately two weeks.
Serve with almond milk, pair it with dairy-free yogurt, or sprinkle it over oatmeal for added crunch and pumpkin-spiced flavor.