Preheat oven to 350 degrees. Line a 9” square glass pan with foil and spray with cooking spray. I do not suggest using a dark or coated pan for these bars!
Make the cookie base: Beat butter and sugars with a mixer until fluffy. Beat in egg, vanilla, and baking soda. Mix in pudding mix and flour. Press into prepared pan.
Make the cheesecake: beat cream cheese and yogurt until no lumps remain. Beat in egg, sugar, vanilla extract, and flour. Mix until smooth. Pour and spread over cookie base.
Bake bars for about 27-30 minutes. They will lose their sheen around the edges, but still wiggle a little in the middle. Remove from oven and immediately sprinkle with toffee bits. Let cool to room temperature and then chill until set, at least 3 hours or overnight. Slice into bars.