01 -
Line an 8-inch square pan with parchment paper, leaving overhang on two sides for lifting the bars out later.
02 -
Add the chocolate chips, peanut butter, butter, and salt to a microwave-safe bowl. Microwave in 20-second bursts, stirring after each, until smooth and glossy.
03 -
Let the melted mixture cool for 5-8 minutes, stirring once or twice. It should be warm and fluid, not hot.
04 -
Fold in the marshmallows, broken pretzels, peanuts, and 1/2 cup of the M&Ms until evenly coated.
05 -
Scrape the mixture into the prepared pan. Press it into an even layer, then sprinkle the remaining 1/4 cup M&Ms on top and press lightly so they stick.
06 -
Refrigerate for at least 1 hour, or until firm. Lift the slab out with the parchment and cut into 16 bars.