In small bowl, combine flour, Cocoa powder, baking soda and salt. Set aside.
In large mixer bowl, combine butter, brown sugar, granulated sugar and vanilla extract. Beat until creamy. Add eggs, one at a time, beating well after each addition. Gradually beat in flour mixture. Stir in 1 package (12 oz) Semi-Sweet Chocolate Morsels, and Quaker Oats and walnuts.
Drop by slightly rounded measuring tablespoonfuls onto ungreased cookie sheet.
Bake 9 to 11 minutes for chewy cookies, or if convection cook for 8 minutes. Let stand 2 minutes before removing from cookie sheet. Cool completely. Makes 3.5 - 4 dozen cookies.
For the flour, alternatively use 1/2 cup whole wheat pastry flour, and 3/4 cup unbleached white flour.