Heat oven to 180ºC degrees. Using a spoon, stir eggswith sugar and vanilla; add butter. Sift ground chocolatewith flour, baking powder, salt. Stir into egg mixture;add nuts. Spread into greased 8 or 23 cm square pan.
Bake at 180ºC for 20 to 30 minutes. For extra chewybrownies, use 20 cm pan and less baking time. For cake-like brownies, use 23 cm pan and longer baking. Cut intosquares.