2 cups flour
1 teaspoon baking soda
1/2 teaspoon salt
1/2 teaspoon baking powder
1/2 cup (1 stick) butter, softened
1/2 cup shortening (or a second stick butter)
1 cup white sugar
1 cup brown sugar
2 eggs
1 generous teaspoon vanilla
2 cups oatmeal
2 cups chocolate chips
Preheat oven to 350 degrees. Sift flour, baking soda, salt, and baking powder together and set aside. Beat butter, shortening, and sugars until fluffy. Add eggs and vanilla and beat until well incorporated. Add half dry ingredients, mix until incorporated, then repeat. Stir in oatmeal and chocolate chips.
Drop cookies onto cookie sheet and bake 9-12 minutes.