Melt the butter in a large saucepan over low heat. Add the marshmallows and stir until fully melted and smooth.

Remove the pan from heat and stir in several drops of orange gel food coloring until the mixture reaches a bright pumpkin shade.

Add the Rice Krispies cereal and mix quickly until every piece is coated.

Scoop out about one-quarter of the warm mixture and press it into a flat round on a sheet of parchment paper. Spoon a tablespoon of chocolate hazelnut spread into the center.

Cover the filling with another portion of the mixture and gently press the edges together to seal. Shape the whole piece into a small pumpkin form. Repeat with the remaining mixture to make four treats total.

Once the treats cool and set, use black decorating icing to draw jack-o'-lantern faces on the front of each one.