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In a mixing bowl, combine the sugar, cocoa, oil, eggs, and milk.
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Combine the flour, salt, and baking powder; add to egg mixture and mix until combined.
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Fold in chocolate chips and 1/2 cup walnuts.
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Spoon 2/3 of the batter into a greased 13 x 9" baking pan.
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Bake at 350° for 12 minutes.
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Meanwhile in a saucepan, heat the caramels and condensed milk over low heat until caramels are melted. Pour over baked brownie layer.
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Sprinkle with remaining walnuts.
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Drop remaining batter by teaspoonfuls over caramel layer; carefully swirl brownie batter with a knife.
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Bake 35-40 minutes longer or until a toothpick inserted near the center comes out with moist crumbs. Cool on a wire rack. Yield: 2 dozen.