Heat oven to 350°F.

Grease 13x9x2-inch baking pan.

Combine flour and brown sugar in large bowl.

Cut in butter until mixture resembles coarse crumbs.

Add egg; mix well. S

tir in 1-1/2 cups chocolate chips and nuts; set aside 1-1/2 cups mixture.

Press remaining crumb mixture onto bottom of prepared pan.

Bake 10 minutes.

Pour sweetened condensed milk evenly over hot crust; set aside 1/4 cup toffee bits.

Sprinkle remaining toffee bits over sweetened condensed milk.

Sprinkle reserved crumb mixture and remaining 1/2 cup chips over top.

Bake 25 to 30 minutes or until golden brown.

Top with reserved toffee bits.

Cool completely in pan on wire rack.

Cut into bars.