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Pour your mini marshmallows into a microwave-safe bowl.
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Add butter, and heat in 30 second bursts until melted.
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Add in vanilla and stir until all clumps of marshmallow are smoothed out. Stir in the Rice Krispies.
Let mixture cool a minute or two before shaping into balls with clean hands (wet your hands with water or oil slightly if the mixture keeps sticking to you).
Insert the Tootsie rolls in the center to make stems while the mixture is still warm.
Set on a lined baking sheet, and cut Fruit Roll-up "leaves" by hand, gently pressing each leaf onto a pumpkin.
Refrigerate until set, at least 2 hours.