1. Preheat oven to 375 degrees Fahrenheit.
2. In a bowl, combine oats, flour, sugars, baking soda, baking powder and salt.
3. Add in vanilla, coconut oil and milk, one tablespoon at a time (if not using coconut, you’ll likely only need two tablespoons), until you’re comfortable with how the cookie dough is binding. Mix in coconut (if you prefer a different mix-in, see note).
4. Using a cookie scoop (I used a one-tablespoon scoop), scoop dough onto a lined baking sheet. Press down slightly with your palm. Bake for eight minutes, until golden brown at the edges. Let cool.