Combine Chex cereal and peanuts in a very large bowl and set aside.
12.8 ounces Chex cereal, 1 cup peanuts
Divide powdered sugar into two large, gallon size ziploc bags and set aside.
2 cups powdered sugar
Line a large baking sheet or surface with parchment paper. Set aside.
Combine chocolate chips, peanut butter and butter in a microwave safe container and melt together on medium heat in the microwave in 30 second bursts, stirring in between until smooth.
10 ounces semi sweet chocolate chips, ½ cup creamy peanut butter, 2 tablespoons salted butter
Drizzle the mixture over the top of the Chex and peanuts and toss gently to combine. Make sure it is well coated.
Gently fold in the Reese's Minis.
8 ounces Reese's Minis
Transfer half of the chocolate-coated cereal mixture into one bag with powdered sugar and half into the remaining bag. Close each bag tightly and gently shake until the mixture is fully coated.
Spread the contents of both bags onto the parchment lined surface and let set up for 15 minutes.
Sprinkle on the Reese's Pieces, Reese's Miniatures, and additional peanuts, peanut butter chips, and Reese's Pieces if desired.
1 cup Reese's Pieces, 20 Reese's Miniatures
Toss gently to combine. Store in an airtight container for up to one week.