Preheat oven to 350 degrees. In a large bowl, cream together butter and shortening until we'll blended. Add sugars and beat until fluffy.
2
Add vanilla & eggs, mixing until blended.
3
In a separate bowl mix the flour, baking soda, baking powder and salt. With mixer on, begin to add the flour mixture to the wet ingredients until well blended. Fold in chocolate chips.
4
On a parchment lined cookie sheet drop rounded teaspoonfuls of dough in rows approx. 2 inches apart.
5
Bake 8-10 mins. or until edges of cookies are brown but centre is still soft. Allow to cool on cookie sheet for 2 mins, then transfer to cookie racks.