GREASE a cookie sheet; SET aside.
In a heavy medium saucepan, HEAT one cup of the chocolate chips, the unsweetened chocolate and the butter until melted, STIRRING constantly.
ADD the eggs, sugar, flour, vanilla and baking powder; BEAT until combined, SCRAPING sides of pan occasionally.
STIR in remaining cup of chocolate chips and the nuts.
On the greased cookie sheet, DROP rounded teaspoons of dough 2 inches apart.
BAKE in a 350° oven until edges are firm and surfaces are dull and cracked, about 8-10 minutes.
TRANSFER to a wire rack; let COOL.
Per Serving (excluding unknown items): 210 Calories; 14g Fat (53.6% calories from fat); 3g Protein; 23g Carbohydrate; 2g Dietary Fiber; 27mg Cholesterol; 31mg Sodium. Exchanges: 1/2 Grain(Starch); 0 Lean Meat; 2 1/2 Fat; 1 1/2 Other Carbohydrates.