Heat oven to 350. Generously grease cookie sheets. In large bowl, combine brownie mix, flour, water, oil and egg. By hand, stir with spoon until dough is formed. Stir in chocolate chips and nuts. Drop by tsp 2" apart onto cookie sheets. Bake at 350 for 8 to 12 minutes. Cool 1 minute. Remove from cookie sheets; cool completely. Frost cookies with chocolate frosting.