Leaf-Shaped Peanut Butter Rice Crispy Treats

in the shape of maple leaves, oak leaves, and acorns with fall-colored sprinkles
mix the following over low heat:
3 Tbsp butter
4 cups mini-marshmallows
1/2 cup creamy peanut butter
remove from heat and stir in 6 cups Rice Crispies
shape with cookie cutters