2To prepare crust: Melt 1/2 cup butter and pour into a 9×13 baking dish. Add your crushed shortbread cookies and 3/4 cup of Toffee Bits. Stir to combine and press evenly into pan. Bake for 10 minutes until just starting to golden up.
3While the crust is baking prepare your top layer:
Cream butter and sugars together until smooth. On medium speed, add in your eggs and vanilla. Turn mixer to low and add in your dry ingredients (baking soda, salt and flour) stirring until just combined. Now add in your toffee chips and chocolate chips. Set this aside.
When you crust is done remove from oven and let cool on a wire rack while you prepare the filling.
4For middle layer:
In a medium saucepan melt your peanut butter chips, semi sweet chips, butter and sweetened condensed milk over low, stirring frequently until completely melted.
5Pour middle fudge layer over the crust and spread evenly to coat.
6Drop spoonfuls of the 'cookie dough' topping evenly over the fudge layer.
7Bake 25 minutes until topping is set. Let cool completely (at least 2 hours) before cutting to allow bars to set up.