Spray the inside of each piping bag with cooking spray. Set aside.

In a large pot, melt butter over low heat. Once butter has melted, add marshmallows and stir until completely melted. Add a few drops of orange food color and stir until fully incorporated. Remove the mixture from the heat.

Add the rice krispies cereal to the marshmallow mixture. Stir until the cereal is well coated (it helps to coat spatula in a little bit of cooking spray).

Using a spatula, scoop 1-2 spoonfuls of rice krispies mixture into each piping bag. Use your hands to press and shape the rice krispies into the bag so that they form a carrot shape. Let cool until krispies reach room temperature.

Once cooled, remove the krispies from the piping bags and place on a wax paper lined work surface.

While the rice krispies are cooling, take a small amount of green fondant, about a 1/2-inch piece, and roll it into a log. Take a second piece of green fondant and roll into a second log.

Press the two pieces of fondant together to make a shape that looks like leaves on the top of a carrot. If needed, use a dab of water to adhere the pieces together.

Press a toothpick into the bottom of the fondant leaves, leaving room so that the rest of the toothpick can be inserted into the carrot krispies.

Repeat steps 1-3 until you have leaves for each carrot krispie.

Gently press one set of leaves into the top of each carrot krispie.