Grammy's Chocolate Chip Cookies!

This is my grandmother's cookie recipe. She is much better at making them then I, but they are the best in the world.
This recipe makes I don't know how many cookies, around 5 dozen or so.
2 c. Shortening
2 C. Brown sugar
1 C. Sugar
4 Eggs
1 T. Vanilla
1 T. Milk
1 t. Baking soda
1 t. Salt
5 C. Flour
1 12 oz. Bag Chocolate Chips

Cream together shortening and sugars. Mix in eggs one at a time. Add vanilla and milk. Mix dry ingredients together, then add gradually to sugar mixture. Stir in chocolate chips.
Bake in oven @ 350 degrees for 8 min.