Prepare Your Work Area. Line a baking sheet with parchment paper and set it aside. This will be where you shape and cool your pumpkin treats.
Melt the Marshmallows. In a large pot over medium heat, melt the butter. Once melted, add the marshmallows and stir constantly until fully melted and smooth.
Add Pumpkin Spice & Color. Stir in the pumpkin spice and orange food coloring until evenly distributed. Adjust the color to your liking for that perfect pumpkin look.
Mix in the Rice Krispies. Remove the pot from the heat and gently fold in the Rice Krispies cereal. Stir until all the cereal is coated with the marshmallow mixture.
Shape the Pumpkins. With greased hands, take a small handful of the mixture and shape it into a pumpkin. Place each one on the prepared baking sheet.
Add the Stems. Insert a green candy or pretzel stick into the top of each pumpkin to create the stem.
Cool and Set. Let the pumpkins cool and set at room temperature for about 20 minutes.
Serve and Enjoy! Your Pumpkin Rice Krispie Treats are ready to enjoy!