PREHEAT oven to 350º F. Grease 13 x 9-inch baking pan.
COMBINE flour, cocoa, baking soda and salt in small bowl. Stir in sugar, butter, eggs, water, oil and vanilla extract vigorously in large bowl. Stir in flour mixture. Stir in nuts. Spread into prepared baking pan..
BAKE for 16 to 20 minutes or until wooden pick inserted in center comes out slightly sticky. Cool completely in pan on wire rack. Cut into bars.