Preheat the oven to 350 degrees. Spray a 9x13 baking dish with cooking spray.
Press half of the cookie dough into the bottom of the prepared baking dish.
In a small saucepan, heat the condensed milk and chocolate chips over low heat, stirring constantly, until the chocolate is fully melted. Remove from the heat and stir in the toffee bits.
Spread the chocolate toffee mixture on top of the cookie dough.
Sprinkle small pieces of the remaining half of the cookie dough over the chocolate mixture. It won't cover the chocolate completely, but it should come fairly close.
Bake for 45 minutes. The top should be golden and the chocolate will be set.
Let cool completely before cutting. The bottom layer will still be slightly gooey and soft, so serve with a fork!