Preheat oven to 350 degrees Fahrenheit.
Prepare a 9"x13" baking sheet with parchment paper. Set aside.
In a medium bowl, whisk together the flour, baking powder, baking soda, ground cinnamon, and salt. Set aside.
In the bowl of a stand mixer, whip the butter with a paddle attachment until completely smooth with no lumps.
Add in both sugars and continue to mix until everything is fully incorporated.
Then, mix in the sourdough discard and vanilla extract until everything is combined.
Add in one egg at a time, mixing just until combined. Do not over mix at this point!
Mix in the dry ingredients. Just until combined. Avoid overmixing.
Remove bowl from the mixer and fold in the oats and chocolate chips with a spatula or wooden spoon.
Scoop out the cookie dough using a cookie scoop and place on the prepared baking sheet.
Place in the oven and bake for 12-14 minutes or until they are golden brown and the center is cooked.
Remove from the oven and place on a wire cooling rack to cool.