Preheat the oven to 375ºF.
Add the oats to the bowl of a food processor and blend until they're a powder-like consistency.
In the bowl of a stand mixer fitted with the paddle attachment, cream together the butter, brown sugar and sugar.
Add the eggs one at a time, mixing after each addition, then add the vanilla.
Add the flour, salt, baking powder, baking soda and blended oatmeal and mix until combined.
Add the chocolate chips and nuts (optional), mixing to combine.
Shape 2 to 3 tablespoons of dough into mounds spaced 2 inches apart on a parchment paper-lined baking sheet.
Bake the cookies for 12 to 15 minutes, or until the tops are golden brown. Remove the cookies from the oven and immediately transfer them to a cooling rack to cool completely.
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