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Preheat oven to 350.
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Grease and flour a 9 x 13 baking pan.
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Combine caramels and evaporated milk in top of double boiler over low heat.
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Cover and simmer until caramels are melted, stirring occasionally.
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Set aside, keeping warm.
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Combine German sweet chocolate and butter in 2 quart saucepan.
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Place over low heat stirring occasionally until melted.
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Remove from heat.
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Cool to room temperature.
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Beat eggs until foamy using electric mixer at high speed.
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Gradually add sugar, beating until mixture is thick and lemon colored.
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Sift together flour, baking powder and salt.
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Add to egg mixture mixing well.
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Blend in cooled chocolate mixture and vanilla.
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Spread half of mixture into prepared baking pan.
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Bake for 6 minutes.
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Remove from oven and spread caramel mixture carefully over baked layer.
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Sprinkle with chocolate chips.
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Stir 1/2 cup of walnuts into remaining chocolate batter.
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Spread batter by spoonfuls over the caramel layer.
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Sprinkle with remaining nuts.
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Bake for 20 minutes.
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Cool in pan on rack.
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Refridgerate before cutting into bars or squares.
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These brownies are very difficult to cut if not chilled first.