Preheat oven to 375°F degrees. Line 2 baking sheets with parchment paper and set aside.
In the bowl of a stand mixer, beat 8 tablespoons butter and ¼ cup coconut oil together until relatively smooth. Add 1 egg and 1 teaspoon vanilla extract and beat until fully incorporated.
Add 1 cup brown sugar and beat until smooth.
Meanwhile, whisk together 1 cup all-purpose flour , ¾ teaspoon baking soda, ¼ teaspoon cinnamon, 1 teaspoon sea salt, 2 cups rolled oats and ⅓ cup unsweetened coconut flakes.
With the mixer on low speed, slowly add the dry mixture and mix until fully incorporated. Don't over mix the dough, just make sure that there are no patches of dry ingredients left.
Using a cookie scoop or a tablespoon measure, scoop dough onto prepared cookie sheet leaving about 2-3 inches between cookies. {I like to make these cookies with a double scoop of dough, resulting in large, chewy cookies.}
Bake for 9-11 minutes or until the edges are lightly browned and the middle is just set.
Remove from oven and allow to cool on cookie sheet for about 5 minutes until they set up so they are easier to move to a cooling rack.