Preheat oven to 350 degrees. Grease a cookie sheet. Beat eggs, sugars, and butter in large bowl until mixture is fluffy, scraping down sides of bowl frequently with rubber spatula. Mix in vanilla. In another bowl, stir together soda, baking powder, salt, flour and oats. Add these dry ingredients to creamed mixture, stirring until well blended. Stir in chocolate chips and nuts. (Dough will be very stiff.) Drop heaping quarter cupfuls or a small (size 16) ice cream scoop of the dough onto baking sheet. Put only eight mounds of dough on baking sheet, staggering them about 3 inches apart. Cookies will spread as they bake. Bake 10 to 15 minutes or until golden brown but still spongy when touched on top. Don”t over bake cookies. They should have a chewy texture. Let cookies cool about five minutes before removing them from baking sheet. Makes about 20 big cookies.