01 -
Preheat the oven to 350°F. Spray a 9x13-inch baking dish with cooking spray.
02 -
In a bowl, combine the cake mix, melted butter, and egg. Press the mixture evenly into the bottom of the prepared baking dish.
03 -
Sprinkle the chocolate toffee bits evenly over the cake mix layer.
04 -
Drizzle the sweetened condensed milk evenly over the toffee bits.
05 -
Bake for 25-30 minutes, or until golden and set. Let the bars cool completely before cutting.