Ingredients

• 2 (7 ounce) bars milk chocolate bars (such as Hershey's®)
• 1 (12 ounce) package semi-sweet chocolate chips
• 1 cup butter
• 1 cup chopped walnuts
• 1/2 (10.5 ounce) package miniature marshmallows
• 1 teaspoon vanilla extract

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Instructions

1. Heat chocolate bars, chocolate chips, and butter in the top of a double boiler over simmering water, stirring frequently and scraping down the sides with a rubber spatula to avoid scorching.
2. Remove chocolate mixture from heat; stir in walnuts, marshmallows, and vanilla until completely coated. Spread mixture into 9x13-inch baking pan, gently pressing down with spatula to evenly flatten out. Refrigerate until hardened, 4 to 5 hours.