In 20 second increments, melt the candy melts or white chocolate in a medium microwave-safe bowl.
Stir after each increment until melted and completely smooth.
Stir in 2 teaspoons of cinnamon, and the pumpkin pie spice until combined.
Pour mixture over cereal and toss gently to coat each square. Be gentle, the squares break easily.
Pour the confectioners' sugar and 1 teaspoon of cinnamon into a large zipped-top bag.
Add the coated cereal and shake until each piece is coated.
Pour back into a large bowl and discard excess confectioners' sugar.
Toss in the mallowcreme pumpkins. Use 1 - 2 cups, whatever amount you prefer.
Cover and store puppy chow for up to 2 weeks.
*Instead of mallowcreme pumpkins, try adding 1 cup of Pumpkin Spice M&Ms or Candy Corn M&Ms, 1 cup of Pumpkin Spice Hershey's Kisses, 1 cup of cinnamon chips, 1/2 cup of orange sprinkles, or even 1 cup of salty pumpkin seeds (which will cut the sweetness of the snack mix).