In a small mixing bowl, stir together flour, baking soda and salt. Set aside.
In a large mixing bowl, cream butter and sugars together until light and fluffy.
Add vanilla and egg. Beat well.
Add dry ingredients to creamed mixture. Mix well.
Stir in chocolate chips. Mix well.
Drop by tablespoons onto a baking sheet. Place each drop 2 inches apart. Bake in a preheated oven for 8-10 minutes.
Remove cookie sheet from oven and place on a cooling rack.