Heat oven to 350°F Lightly spray bottom and sides of 13x9-inch pan with cooking spray. In large bowl, stir cookie mix, pudding mix, brown sugar, melted butter, 1 teaspoon of the vanilla and 1 whole egg until soft dough forms. Press dough in bottom and 1/2 inch up sides of pan.
In small bowl, beat cream cheese, sour cream and sugar with electric mixer on medium speed until smooth. Add remaining whole egg, 3 egg yolks and remaining 1 1/2 teapoons vanilla; beat until smooth. Spread over crust in pan.
Bake 30 to 35 minutes or until set in center. Immediately sprinkle top with crushed toffee bits. Cool 30 minutes. Refrigerate about 3 hours or until chilled. For bars, cut into 9 rows by 4 rows. Store covered in refrigerator.