Preheat oven to 325 degrees
Mix together cake mix, one egg and 1 stick of softened butter.
Pat down into a 9x13 greased baking pan to make it like a flat crust
In a mixer beat cream cheese until smooth.
Add vanilla and eggs and beat again until blended.
Add 1/4 cup softened butter and blend just until incorporated.
Slowly add in powdered sugar on low speed and mix until incorporated do not over mix it.
Stir in chocolate chips and toffee pieces and pour over cake mix crust.
Bake for 35-45 minutes until lightly browned.