In a large bowl, mix the softened butter with brown sugar until very creamy. This is an essential step for the cookies to remain soft; you’ll need about 5 minutes to achieve the desired texture. Then add the vanilla extract and the pumpkin puree (which should be at room temperature; otherwise, it will break the emulsion between the butter and sugar), mix until well combined.
In a different bowl, combine all the dry ingredients (oats, flour, spices, baking powder and baking soda, salt, and orange zest).
Add the dry ingredients with the pumpkin mixture and stir to combine.
Refrigerate the dough for one to two hours. This will improve its texture and flavors, so don’t skip this step.
When you’re ready to bake, preheat the oven to 350F.
Scoop the dough using a 1 1/2 tablespoon ice cream scoop and lightly flatten the top of each cookie.
Bake for 12 to 15 minutes or until the cookies are set and slightly brown in the edges but still soft in the center.
Allow the cookies 10 minutes to cool before transferring them to the cooling rack, or they might break.
To make the orange glaze, you just need to mix all the ingredients until well combined. Then, once the cookies are chilling in the cooling rack, drizzle them with the orange glaze.