Preheat the oven to 350 F. Mix the pumpkin, oil, egg, vanilla, and sugar in the bowl of a stand mixer until creamy.
In a separate bowl, gently place the activated charcoal at the bottom of the bowl. Charcoal will puff up everywhere if you just throw it around and it leaves a fine black coating on EVERYTHING (trust me). Gently add the other dry ingredients: flour, cocoa powder, baking soda, cinnamon.
Slowly add in the flour mixture while the mixer is off. Mix everything together on low speed til combined. Do not overmix.
Fold in the chocolate chips with a rubber spatula.
Line two (or three, possibly) baking sheets with Silpat or parchment paper. Use a spoon to drop cookies, spacing about an inch apart. These cookies don't spread much.
Bake for 14 minutes (if there's one cookie sheet on the top and one on the bottom rack, switch then at 7 minutes) and let rest on cooling racks.