In large mixing bowl, place butter and sugar. Cream together with an electric mixer until well combined and fluffy.
Add in flour, egg, and vanilla. Beat again until fully incorporated and a dough is formed, scraping down sides as needed.
Add in chocolate chips and stir by hand until mixed in.
Spray 9x9 or 8x8 inch baking dish with cooking spray.
Spoon dough into dish. Using wet hands pat out into dish until it is even.
Bake for 25-30 minutes, or until just lightly browned on the edges, being careful not to over bake. Allow to cool before cutting.
* If nutritional values are provided, they are an estimate and will vary depending on the brands used. The values do not include optional ingredients or when ingredients are added to taste.
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