Heat oven to 325°. Grease 9-inch square baking pan.
In bowl, stir together flour, baking soda and salt.
In medium saucepan, combine sugar, butter and water.
Cook over low heat, stirring constantly,
until mixture comes to boil. Remove from heat;
immediately add 1 cup chocolate chips,
stirring until melted.
Stir in eggs and vanilla until blended.
Gradually add flour mixture, blending well.
Stir in remaining 1 cup chips and nuts, if desired.
Pour batter into prepared pan.
Bake 25 to 30 minutes or until brownies
begin to pull away from sides of pan.
Cool completely in pan on wire rack.
Cut into squares.
About 1-1/2 dozen brownies.