Preheat oven to 350 degrees. In a large saucepan, over very low heat melt chips and butter. Stir occasionally until well blended; remove from heat. Add biscuit baking mix, sweetened condensed milk and egg; stir well. Stir in nuts. In greased 13 by 9 inch baking dish; pour brownie mixture into dish. Bake 20 to 25 minutes. Cool slightly. Cut into squares. Frost them if desired.
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