Place chocolate in a large microwaveable bowl. Microwave for 30 seconds and stir chocolate. Add in the butter and microwave another 30 seconds. Stir. Add in the peanut butter and microwave on 15 second intervals, stirring in between until smooth.
Place cereal in a large bowl. Pout 1/3 of the chocolate mixture over the cereal, stir until evenly coated. Pour another 1/3 of the chocolate and stir. Add additional chocolate and stir until everything has a good coating of chocolate.
Evenly spread this over a sheet tray and let sit to cool for about an hour.
In a small bowl, add the powdered sugar and pumpkin pie spice. Whisk to combine. Add 1/2 Cup of the powdered sugar mix into a gallon sized zip lock bag. Add the chocolate coated cereal into the bag, about 2 cups at a time. Zip the bag and toss until all the cereal is coated. Pour the coated cereal into a large container and keep repeating the process until all the chocolate cereal is coated with powdered sugar.
Pour the M&M's and unwrapped kisses in with the cereal, toss to combine. Serve and enjoy!