Combine flour and granulated sugar in large bowl. Cut in butter with pastry blender or 2 knives until mixture resembles coarse crumbs. Remove 1 cup flour mixture; reserve for later use.
Add drink mix, baking powder and baking soda to remaining flour mixture; mix well. Add buttermilk, egg and vanilla; whisk until blended. Stir in half the chocolate.
Pour into parchment-lined 9x5-inch loaf pan sprayed with cooking spray.
Stir brown sugar into reserved flour mixture; sprinkle over batter in pan. Top with remaining chocolate.
Bake 55 min. or until toothpick inserted in center comes out clean. Cool in pan 10 min. Remove from pan to wire rack; cool completely.
Calories From Fat
% Daily Value*
Total Fat 12g
Saturated Fat 8g
Trans Fat 0g
Total Carbohydrates 43g
Dietary Fiber 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.