Preheat the oven to 350°F. Line a baking sheet with parchment paper.
Mix together the butter, brown sugar, vanilla, and pumpkin puree in a bowl. In a separate bowl, whisk the flour, salt, baking soda, baking powder, and pumpkin spice.
Add the wet ingredients to dry ingredients and stir until just combined. Refrigerate the dough for 30 minutes.
Form 16 dough balls and place onto baking sheet, spacing them about 2 inches apart. Press down on each dough ball to flatten into a round disk. Press a few M&Ms into the top of each cookie. I used about five candies per cookie. Bake the cookies for about 12 minutes.
The nutrition information provided are only estimates based on an online nutritional calculator. This is not a comprehensive list of all the nutrients in the recipe (i.e., does not include vitamins, cholesterol, etc). I am not a certified nutritionist. Please consult a nutritionist or doctor for accurate information and any dietary restrictions and concerns you may have.