Late night chocolate-chips

Cream:
1 c butter (or ½ c butter + ½ c margarine)
¾ c sugar
¾ c brown sugar

Add, beating well:
2 eggs
1 t vanilla

Mix separately, then add:
2 ¼ c flour
1 t baking soda
1 t salt

Stir in :
2 c chocolate chips

Preheat oven to 350 degrees. Drop by spoonfuls onto cookie sheets. Bake 8 to 10 minutes until light brown. Allow cookies to cool on a baking sheet for five minutes, then remove and cool on a wire rack.