line a 9x13 inch pan with parchment or coat with nonstick spray.
Crust
measure out 1 1/2 cups dry cake mix and set aside for the crumble
in a bowl mix remaining cake mix with 1/2 cup melted butter and 1 egg until thick crumbs form
press evenly into pan.
Filling
beat cream cheese until smooth
beat in powdered sugar then egg vanilla and salt until creamy
fold in well drained crushed pineapple and optional coconut or pecans
spread evenly over crust.
Crumble and Bake
cut 1/2 cup cold cubed butter into reserved 1 1/2 cups cake mix until coarse crumbs form
sprinkle evenly over filling
bake until edges are set and topping is lightly golden 33 to 38 minutes
cool completely then chill 1 hour before slicing for clean bars.
Notes
1. Drain pineapple until very dry to prevent soggy bars. Use full fat block cream cheese for best texture. Chill before slicing and wipe knife between cuts. Swap yellow cake mix for white or butter cake mix. Add coconut or pecans for extra texture