In a stand mixer, beat butter and sugar together on medium speed for about 3 minutes, until the mixture is very smooth.
Mix in vanilla until it is completely incorporated.
Reduce mixer speed to low and add flour, mixing just until it disappears into the dough.
Fold in the chocolate chips.
Gather dough and place in between two sheets of parchment paper. Roll the dough into a rectangle shape about 1/4 inch thick.
Refrigerate the dough for at least 2 hours.
After dough is firm, preheat the oven to 325°F. Cut the dough into 1 1/2-inch squares and place onto a baking sheet lined with parchment paper, spacing cookies 3/4 inch apart.
Bake for 18 to 20 minutes, until they turn golden brown around the edges.
Cookies should be stored in airtight container at room temperature.
The nutrition information provided are only estimates based on an online nutritional calculator. This is not a comprehensive list of all the nutrients in the recipe (i.e., does not include vitamins, cholesterol, etc). I am not a certified nutritionist. Please consult a nutritionist or doctor for accurate information and any dietary restrictions and concerns you may have.