Heat oven to 350F. Grease 13x9x2 inch baking pan. In large bowl, stir together flour and brown sugar. Cut in butter until mixture resembles coarse crumbs. Add egg; mix well. Stirr in 1 1/2 cups chocolate chips and the nuts. Reserve 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; top with 1 1/2 cups toffee bits. Sprinkle reserved crumb mixture and remaining 1/2 cup chips over top. Bake 25-30 minutes or until golden brown. Sprinkle with remaining 1/4 cup toffee bits. Cool completely in pan on wire rack. Cut into 36 bars.
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