Preheat the oven to 350°F (175°C).

Grease a 9x13 inch baking pan with butter or line it with parchment paper.

In a mixing bowl, cream together the softened butter, brown sugar, and granulated sugar until light and fluffy.

Mix in the eggs one at a time, followed by the vanilla extract.

In a separate bowl, whisk together the flour, baking soda, and salt.

Gradually add the dry mixture to the wet ingredients, stirring until just combined.

Fold in the chocolate chips gently.

Spread the dough evenly in the prepared pan and bake for 20 minutes.

Allow the cookies to cool in the pan for about 10 minutes before cutting into squares.