In a large sauce pan over medium heat, melt the sugar, corn syrup, and peanut butter until smooth and evenly combined.
1 Cup Sugar, 1 Cup Corn Syrup, 1 1/3 Cup Creamy Peanut Butter
Remove from heat.
Quickly add the marshmallow fluff, salt and cereal and stir to combine thoroughly.
1/3 Cup Marshmallow Fluff, 6 Cups Rice Krispies, 1/2 teaspoon Salt
Add the chocolate chips and stir again.
1/2 Cup Chocolate Chips
Wait about 2 min and add the mini marshmallows, quickly folding the mixture together then add all but 4-5 Reese's candy and stir carefully so as to not smash up the candy too much.
10.5 Ounce Bag Reese's Peanut Butter Cups, 4 Cups Mini Marshmallows
Line a 9x9" square pan with parchment paper, spray with nonstick spray and spread the mixture in. Top with chopped Reese's.