Preheat oven to 350° and grease bottom and 2" up sides of 13 x 9" baking dish.
Crust & Topping:
Stir together flour, salt, and baking soda. Set aside.
In large bowl, cream butter and both sugars. Stir in egg and vanilla. Beat in flour mixture until combined. Do not over mix. Fold in chocolate chips and pecans.
Set aside 1/3 of dough for topping. Press remaining dough into bottom of greased 13 x 9" dish. Bake for 8 minutes.
Cheesecake Filling:
Meanwhile, beat cream cheese and sugar until smooth and creamy. Add eggs one at a time, then vanilla. Pour over crust.
Dollop teaspoonfuls of reserved topping dough over filling.
Bake for 35 - 40 minutes, or until top is golden brown.
Cool on wire rack and store in refrigerator. Enjoy!
Notes
To get 36 servings, cut 4 ways on short side, and 9 ways on long side.