Preparation / Directions:
*do not use self-rising flour In this recipe.
Heat oven to 350 degrees. Mix flour, brown sugar, cocoa, baking soda and salt with fork in ungreased square pan, 8 X 8 X 2 inches. Stir in remaining ingredients except chocolate chips. Sprinkle chocolate chips and walnuts over batter.Bake 35 to 40 minutes or until wooden pick inserted in center comes out clean. Cool on wire rack. Sprinkle with powdered sugar if desired.
To Microwave: Mix batter in ungreased round microwavable dish, 8 X 1-1/2 inches. Elevate dish on inverted microwavable pie plate in microwave oven. Microwave uncovered on medium (50%) 15 to 17 minutes, rotating dish 1/4 turn every 5 minutes, until top springs back when touched lightly. (Top may appear wet but will continue cooking as cake stands.) Let stand on flat, heatproof surface (not wire rack); cool.