Lightly spray a baking sheet with non-stick cooking spray and prepare workspace.

Melt 3 tablespoons butter in a large pot over medium heat.

Add 6 cups marshmallows and stir until completely melted and smooth.

Remove from heat and stir in orange gel food coloring until evenly distributed.

Add 6 cups Rice Krispies cereal and stir until evenly coated.

Spray hands with non-stick spray and shape mixture into 10 round pumpkin balls, slightly flattened at the bottom.

Insert one Tootsie Roll in the top of each ball as a stem and press one green M&M beside it as a leaf.

Allow pumpkins to set at room temperature for 1 hour before serving.