01 - Preheat the oven to 350°F. Grease a 9x13 inch baking pan or line with parchment paper for easy removal.
02 - In a large bowl, combine the cake mix, melted butter, and egg. Mix until a soft, cohesive dough forms.
03 - Press the dough evenly into the prepared baking pan, creating a uniform base layer.
04 - Bake for 15 minutes until just set but not browned.
05 - Remove from the oven. Sprinkle chocolate chips evenly over the hot base. Let sit for 2-3 minutes until melted, then gently spread with a spatula.
06 - Sprinkle toffee bits and chopped pecans over the melted chocolate layer.
07 - Return to the oven for 8-10 minutes until the toppings are slightly bubbly and edges are golden.
08 - Let cool completely in the pan before cutting into 16 bars.