Butter a large saucepan and melt the butter over medium heat, releasing a warm, buttery aroma.
Add the marshmallows to the melted butter, stirring constantly until they are fully melted and the mixture is smooth and glossy.
Stir in the cinnamon, which will fill your kitchen with a cozy, spicy scent.
Remove the pan from heat and mix in the orange food coloring, stirring until the mixture reaches a vibrant, pumpkin-orange hue.
Pour the colorful mixture over the rice cereal in a large bowl and gently fold together with a spatula until evenly coated.
Once combined, scoop the mixture out and form small pumpkin shapes using your hands or a mold — squeeze gently to create a rounded pumpkin form.
Place the shaped treats onto a parchment-lined tray to set, pressing a little green or black sprinkle on top to resemble pumpkin stems or spooky accents.
Allow the treats to cool at room temperature for about 10-15 minutes until they are firm and crunchy, perfect for biting into.