Preheat the oven to 350 degrees F. Line two cookie sheets with parchment paper.
Place the gluten free oats in a food processor and process until they are finely ground.
Combine the ground gluten free oats, gluten free flour, cocoa powder, salt, baking soda, and cornstarch in a medium sized bowl. Set aside.
In a mixing bowl, cream the butter and sugars until light and fluffy. Add the vanilla extract and beet puree and mix together.
Add the dry ingredients a little at a time while mixing on low speed until incorporated.
Turn off the mixer and stir in the dairy free chocolate chips.
Drop the batter by large tablespoonfuls onto the cookie sheets.
Bake at 350 degrees F for about 10-12 minutes. Let cool on the cookie sheet for 10 minutes before removing to a wire rack to finish cooling.
Notes
To make beet puree: Peel two small beets and cut into large chunks. Place in a small pan with enough water to cover and bring to a boil. Simmer until the beets are tender, about 20 minutes. Place the beets and a tablespoon or two of the water into a food processor and process until very smooth.If you can't have beets, use an equal amount of mashed banana, unsweetened applesauce, or prune puree.You can freeze this cookie dough - just drop onto a cookie sheet and place in a freezer for one hour. Then remove and place the cookie dough balls into a freezer bag. Store in the freezer for up to three months.