Lydia's Chocolate Chip Cookies

3/4 cups butter, softened
1 cup packed brown sugar
1/2 cup white sugar
1 tablespoon vanilla extract
1 egg
1 egg yolk
2 cups flour
1/2 teaspoon baking soda
1/2 teaspoon salt
1 1/2 cups chocolate chips

1. Preheat oven to 325 degrees. Grease cookie sheets with cooking spray. 
2. In a medium bowl, mix flour, baking soda, and salt.
3. In a large bowl, cream together butter, brown sugar, and white sugar until light and fluffy. Beat in egg, egg yolk, and vanilla extract until creamy. 
4. Beat in flour mixture.
5. Mix in chocolate chips with a spatula or wooden spoon. 
6. Refrigerate dough for 30 minutes so dough is easier to handle. 
7. Roll dough in to balls and press down slightly on cookie sheets. Dough should be 2 inches apart.
8. Bake for 15 to 17 minutes in preheated oven or until edges are just turning brown. Do not over bake. 
9. Cool for 5 minutes.