Combine flour, granulated sugar, baking soda and salt in large bowl. Microwave water, 3/4 cup butter and 2 oz. chocolate in microwaveable bowl on HIGH 2 min.; stir. Microwave 2 min. or until chocolate is completely melted and mixture is well blended, stirring after each minute. Add to flour mixture; mix well. Add buttermilk, eggs and 1 tsp. vanilla; beat with mixer 1 min. or until blended. Pour into 15x10x1-inch pan sprayed with cooking spray.
Bake 18 to 20 min. or until toothpick inserted in center comes out clean. About 5 min. before cake is done, microwave milk with remaining butter and chocolate in large microwaveable bowl 2 min. or until chocolate is completely melted and mixture is well blended, stirring after each minute. Add powdered sugar and remaining vanilla; beat with mixer until blended.
Savor a serving of this crowd-pleasing dessert on special occasions.
Substitute for Buttermilk
Don't have buttermilk? Place 1 Tbsp. HEINZ Distilled White Vinegar in measuring cup. Add enough 2% milk to measure 1/2 cup. Let stand 5 min., then use as directed.
Calories From Fat
% Daily Value*
Total Fat 11g
Saturated Fat 7g
Trans Fat 0g
Total Carbohydrates 46g
Dietary Fibers 1g
* Percent Daily Values are based on a 2,000 calorie diet.
* Nutrition information is estimated based on the ingredients and cooking instructions as described in each recipe and is intended to be used for informational purposes only. Please note that nutrition details may vary based on methods of preparation, origin and freshness of ingredients used.