Chocolate Chip Oatmeal Cookies

2 C brown sugar
2 C granulated sugar
2 C butter
4 eggs
2 tsp. baking powder
1 tsp. salt
2 tsp. soda
2 tsp. vanilla
4 C flour
5 C. oats
1 lg. pkg. chocolate chips

Cream sugars and butter. Add eggs and mix. Add baking powder, salt, soda and vanilla; mix. Add flour and mix. Mix in oats. Stir in chocolate chips. Drop about 1 Tbs. balls onto ungreased cookie sheet. Bake at 400 degrees for 6-8 min.