Preheat the oven to 350 degrees F. Prepare 2 baking sheets with parchment paper or lightly grease with cooking spray.
In the bowl of a stand mixer fitted with the paddle attachment or in a large bowl with a handheld mixer, cream together the butter and sugars until light and fluffy, 1-2 minutes. Add eggs and vanilla and beat until creamy and well-combined, 1-2 minutes. Add baking soda, baking powder, salt and mix well. Add flour, oatmeal and chocolate chips. Mix until no dry streaks remain.
Scoop the cookies into balls using a cookie scoop, or about 2 tbsp of dough.
Bake at 350 degrees for 9-11 minutes. If you oven has a convection setting, bake on convection at 325. If your cookies are spreading, try upping the temperature to 375.