Step 1

Grease an 8 or 9-inch square baking pan and a large bowl with cooking spray, butter, or Crisco. Add the cereal to the large bowl. Set aside.

Step 2

In a saucepan over medium-low heat, melt the butter.

Step 3

Add the chocolate chips, peanut butter, and marshmallows. Heat, stirring frequently, until the mixture is smooth and fully melted.

Step 4

Scrape the mixture over the cereal and fold to combine. Stir very well.

Step 5

Transfer the mixture to the prepared baking pan. Use a spatula to press the treats evenly into the pan. Chill for 2 hours.

Step 6

Cut into squares.