Preheat oven to 350 degrees F. Spray 9x13" baking dish with cooking spray. Set aside.

In large bowl, stir together flour and brown sugar.

Cut in butter with pastry blender, two knives, or your fingers until the mixture resembles coarse crumbs.

Add egg and mix well.

This part seems like it's not going to work but just keep mixing until egg is evenly distributed.

Stir in 1 ½ cups of chocolate chips.

Reserve 1 ½ cups of mixture and press remaining onto bottom of prepared pan.

Bake in preheated oven for 10 minutes.

Once partially baked, pour can of sweetened condensed milk over crust.

Reserve ¼ cup of toffee bits and pour remaining toffee over milk layer in pan.

Sprinkle reserved crumb mixture and remaining ½ cup chocolate chips over top.

Bake in preheated oven for 25-30 minutes, until golden brown.

Sprinkle with remaining toffee bits and cool completely.

Once cooled, cut into bars. Enjoy!