Preheat oven to 350°F. Spray pan with vegetable pan spray. In a large mixing bowl, cream butter with sugars. Add egg and vanilla and mix well. Stir in flour, baking soda and salt; mix well. Stir in chocolate chips. Spread dough into prepared pan with spatula. Bake 15-20 minutes or until light golden brown. Cool on rack for 5 minutes. Remove from pan. Cool before cutting. Decorate.
Makes 8-10 servings.