Preheat oven to 350 degrees F. In 3-quart saucepan, melt margarine. Remove from heat. Add sugar, flour, cocoa, baking soda, salt, eggs and vanilla extract. Stir with spoon until batter is well blended and smooth. Stir in 1 1/2 cups chocolate chips. Spread into 9x13-inch pan. Sprinkle with remaining chips. Bake for 25-30 minutes. |