Spray a 9x13-inch pan well and set aside. Add cereal to a large bowl.
In a separate large microwave-safe bowl, add 5 cups marshmallows, 1-1/2 cups chocolate chips, butter, corn syrup, and salt. Microwave in 20-second bursts, stirring well each time (scraping the bottom), until melted and smooth—about 2 to 4 minutes total. Don’t overheat.
Stir in vanilla, then quickly pour the mixture over the cereal. Toss until evenly coated. Take your time here—make sure every piece is well coated. Stir gently to not crush the cereal.
Stir in the remaining 1 cup marshmallows and ½ cup chocolate chips. Pour into the prepared pan.
Lightly spray your hands with cooking spray and gently press the mixture into the pan. Don’t press too hard or the bars will be too firm.
Let sit uncovered at room temp for 1 hour, or refrigerate for firmer bars.
Video
Notes
Note 1: Or try Malt O Meal® Honey Graham Toasters.Note 2:Use high-quality milk chocolate for the best flavor and melt. I like Ghirardelli® or Guittard®. Cheaper brands can be waxy and melt poorly.Storage: Store bars in an airtight container at room temperature. Best enjoyed the same day they’re made.