Preheat oven to 350 degrees and grease a cookie sheet.
In a large bowl, whisk together the oat flour, baking soda, spices, and salt.
Using a stand mixer with a paddle attachment or an electric hand mixer, cream together the butter and sugar.
Add the egg, vanilla, pumpkin puree, and maple syrup and mix until well combined.
Finally, add the dry ingredients. The dough will be thick and soft. More like batter than standard cookie dough.
Drop large spoonfuls (about 3 tablespoons each) onto the prepared cookie sheet, leaving about 2 inches between each cookie.
Bake the cookies for 13-17 minutes or until the tops are firm to the touch, and they're beginning to turn golden.
Leave them on the cookie sheet to cool for 10 minutes before moving them to a wire rack to finish cooling.