King Arthur chocolate chip oatmeal cookies

Ingredients

1 C butter
1 C brown sugar
½ C sugar
1 egg
1 egg yolk
1 T vanilla
2 C flour
1 C oats
1 t baking powder
1 t baking soda
¾ t salt
3 C chocolate chips

Directions

Preheat oven to 325°F.
Cream butter and sugars.
Beat in egg, egg yolk, and vanilla.
Add remaining ingredients (except chocolate chips).
Stir in chocolate chips.
Drop onto greased cookie sheet.
Bake 12-15 minutes.