Preheat the oven to 350 degrees F. Line a baking sheet with parchment paper and set aside.
In a large mixing bowl, combine the dry ingredients and mix until incorporated. In a separate mixing bowl, beat all the wet ingredients until combined and smooth. Add the wet ingredients to the dry ingredients and mix until a dough forms.
Scoop the dough onto the cookie sheets (I use an ice cream scoop to do this). Flatten with the back of a wet fork and bake in the center of the oven for 13 - 15 minutes, until the cookies have started to brown and are a little crispy to the touch.
Cool on the cookie sheet for a few minutes, then transfer to a wire rack and cool for another 5 or 10 minutes.
Notes
If you don't follow a gluten-free diet, feel free to substitute regular rolled oats and oat bran - there will be no change in texture or flavor!