Preheat your oven to 375°.

Grease a 10-inch cast iron pan with a little vegetable oil.

In a large mixing bowl, combine your sugar, butter, vanilla, and mix with a hand mixer.

Add in your egg and mix well.

Now add your flour, salt, and cinnamon and mix together.

Add your oats and chocolate chips and mix until just combined.

Scoop your cookie dough into your cast iron pan and press down

Cook for about 23 minutes, until it is puffed, golden, and the edges have nicely browned.

Let cool completely on a wire rack, cut into slices, and enjoy!