ROCKY ROAD BROWNIES: Retro Ad & Recipe

Yesterday was Rocky Road Day, and I posted a recipe for Rocky Road Truffles. Here's a 1971  Diamond Walnuts Retro Ad & Recipe for Rocky Road Brownies. The recipe is really for transforming your favorite brownies into Rocky Road Bars with a thick Rocky Road frosting. So make a batch of brownies either from a box or from scratch and follow these directions.

ROCKY ROAD BROWNIES

Ingredients
9-inch square pan of brownies
1 ounce square unsweetened chocolate
2 tablespoons soft butter
1-1/2 cups powdered sugar
4 tablespoons milk
1/2 cup miniature marshmallows
1/2 cup coarsely-chopped walnuts

Directions
Prepare brownies from your own recipe or a mix. Melt chocolate. Combine with soft butter, powdered sugar and milk; beat smooth. Spread over top of cooled brownies. Sprinkle with marshmallows and walnuts. With small spatula, swirl frosting around marshmallows and walnuts. Let frosting set before cutting.