Preheat the oven to 350 °F. Prepare a large cookie sheet by lining with a silicone mat.
In a large bowl, cream together butter and sugars. Add the egg and vanilla and mix until well combined. Add the baking soda and salt and combine. Then mix in the oat flour until fully incorporated. Fold in the chocolate chips.
Scoop the dough into 1.5-2 tablespoon balls, place on your prepared baking sheet and lightly squish down so they are a bit wider than tall.
Bake for 8-11 minutes until the edges are set and very lightly browned. The centres will be soft.
Let cool on the baking sheet for 5 minutes before using a spatula to move cookies to a wire rack to cool completely.