1. Heat oven to 350°F. Grease 9-inch square baking pan.
2. Place chocolate and butter in medium microwave-safe bowl. Microwave at MEDIUM (50%) 1 minute; stir. If necessary, microwave an additional 15 seconds at a time, stirring after each heating, until chocolate is melted and mixture is smooth when stirred. Add eggs, vanilla and instant coffee, stirring until well blended. Stir in sugar, flour, baking soda and salt; blend completely. Stir in nuts, if desired. Spread batter in prepared pan.
3. Bake 25 to 30 minutes or until wooden pick inserted in center comes out almost clean. Cool completely in pan on wire rack. Cut into bars. Makes 16 brownies.