Using a hand held or stand mixer, cream together the butter, sugar, salt and vanilla until light and fluffy. Using a wooden spoon or spatula, stir the flour in by hand. When it's fully incorporated, stir in the chocolate chips.
Pour cookie dough into a 9 X13 metal baking pan. Press dough very, very, very firmly until the top is silky smooth.
Bake for 20-25 minutes until slightly golden on edges. Cool for 10 minutes then cut into triangles with a sharp knife. If you wait too long they are too difficult to cut, any shorter they will smoosh.