1.Combine 1 1/4 cups all-purpose flour and 1/3 cup firmly-packed brown sugar. Cut in 1/2 cup butter until mixture is crumbly. 2. Press evenly in 13x9-inch baking pan. Bake at 350F for 8 to 10 minutes, until lightly browned. 3. Melt 4 square baking chocolate over hot water; cool. 4. Combine 2 lightly beaten eggs, 1/2 cup corn syrup and 1/2 cup firmly-packed brown sugar; blend in 2 tbsp. All-purpose flour and melted chocolate.. 5. Pour over baked crust. Sprinkle 1 cup chopped nuts over surface. 6. Bake at 350F for 15 to 18 minutes or until set. 7. Cool and cut into bars. Makes about 3 dozen bars.