Preheat oven to 375 °F. In a small bowl, combine flour, oatmeal, baking soda and salt; set aside. In a large mixing bowl, cream together butter and sugars until light and fluffy; beat in eggs and vanilla extract. Gradually blend in flour mixture. Stir in chocolate morsels, M&M and nuts, if using. Drop by rounded measuring tablespoonfuls about 2 inches apart onto ungreased cookie sheets. Bake 9 to 11 minutes, until edges are golden brown. Cool 2 minutes on cookie sheet; place on wire cooling racks. Store in tightly covered container.