Preheat your oven to 350°F (175°C) and line a baking sheet with parchment paper.

In a large mixing bowl, combine pumpkin puree, granulated sugar, brown sugar, and vegetable oil, mixing until smooth.

Add maple syrup, all-purpose flour, rolled oats, baking soda, ground cinnamon, salt, and ground nutmeg. Stir until just combined.

Use a tablespoon or cookie scoop to drop the dough onto the prepared baking sheet, spaced about 2 inches apart.

Bake for about 10 minutes until edges are set and tops are slightly cracked.

Let the cookies cool on the baking sheet for a few minutes before transferring to a wire rack.

Mix powdered sugar, cinnamon, and water in a small bowl until smooth for the frosting.

Once cooled, generously spread the cinnamon frosting on each cookie and enjoy!