Preheat oven to 350. Grease 8 in sq baking pan.
Combine flour, cocoa and salt in small bowl. Beat butter, white & brown sugars in large mixer bowl until creamy. Add eggs, 1 at a time, beating well after each. Add vanilla extract, mix well. Gradually beat in flour mixture. Reserve 3/4 batter. Spread remaining batter into prepared baking pan. Sprinkle nuts and white morsels over batter. Drizzle caramel topping over top mix mixture. Beat remaining egg and reserved batter in same large bowl until light in color, stir in sem-sweet morsels. Spread evenly over caramel topping.
Bake 30-35 minutes or unitl center is set. Cool completely on wire rack, cut into squares.
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