Preheat oven to 350° Fahrenheit and line a large baking sheet with parchment paper.

Beat together the butter, brown sugar, and sugar in a large bowl with either a hand or stand mixer until light and fluffy. Add in the egg and vanilla extract, beat to combine.

Add oat flour, baking soda, and salt into butter mixture and beat until a dough forms. Then, fold in rolled oats and chocolate chips until evenly distributed throughout.

Drop tablespoon-sized balls of dough about 2-inches apart on prepared baking sheet and bake for 10 minutes, or until lightly golden brown. Let cookies cool on baking sheet for 5-10 minute, then transfer to a wire rack to cool completely.