Directions: PREHEAT oven to 325° F. Grease 13 x 9-inch baking pan.
COMBINE flour, cocoa, baking soda and salt in small bowl. Beat butter, sugar and vanilla extract in large mixer bowl until creamy. Add eggs, one at a time, beating well after each addition. Gradually beat in flour mixture. Stir in 3/4 cup morsels and 1/2 cup nuts. Spread into prepared baking pan. Sprinkle remaining morsels and remaining nuts over top.
BAKE for 25 to 30 minutes or until toothpick inserted 2 inches from outer edge comes out clean. Cool completely in pan on wire rack. Drizzle with caramel sauce before or after cutting into squares. Serve with ice cream, if desired.