Preheat your oven to 350°F (175°C). Grease the baking pan or line it with parchment paper for easy removal.
In a large mixing bowl, beat together the softened butter, brown sugar, and granulated sugar until creamy and well combined.
Add the eggs one at a time, mixing well after each addition. Stir in the vanilla extract.
In another bowl, whisk together the flour, baking soda, and salt.
Gradually add the dry ingredients to the wet ingredients, mixing until just combined.
Fold in the chocolate chips with a spatula or wooden spoon until evenly distributed.
Spread the cookie dough evenly into the prepared baking pan, smoothing the top with the spatula.
Bake in the preheated oven for 20-25 minutes or until the edges are golden brown and a toothpick inserted into the center comes out clean.
Allow the cookie bars to cool in the pan for about 10 minutes before cutting into squares.