Preheat the oven to 300 degrees F.
Line a sheet pan
with parchment paper or a baking mat.
Put 2 cups of the oats in the food processor
until finely ground and floury.
In a mixer
fitted with the paddle attachment, cream
until soft and smooth. Mix in the brown sugar. Add the eggs
and vanilla and mix until well blended.
In another bowl, stir together both the ground and the whole oatmeal
, the baking soda and salt.
With the mixer running at low speed, add the dry ingredients to the butter mixture and mix until just blended. Add the chocolate chips
and mix just until blended. (The cookie
dough can be made and kept refrigerated for up to 3 days before baking. Or you can make lumps of dough
and freeze them in a locked plastic bag, then take them out for baking a few at a time. Add an extra minute to the baking time.)
Drop the batter
by teaspoonfuls onto the pan, leaving 3 inches between them, as they will spread. Bake until lightly browned, about 13 to 15 minutes. Let cool on the pan, then remove with a spatula