Wipe down the pan with just a bit of olive oil.
Melt the marshmallows and butter for the yellow ring in the microwave in a microwave safe dish in 30 second increments. Total time of melting will vary based on the microwave but do not go over 2 minutes or you will burn the marshmallows.
Combine the first bowl of marshmallow with the yellow food coloring and Rice Krispies and mix.
Wet your hands and form the yellow ring for the Halloween Candy Corn Rice Krispie Treats in the round pan.
Melt the marshmallows and butter for the orange ring in the microwave in a microwave safe dish in 30 second increments. You will need about 1:30 seconds for this.
Combine the second bowl of marshmallow with the orange food coloring and Rice Krispies and mix.
Wet your hands and form the orange ring for the Halloween Candy Corn Rice Krispie Treats in the round pan.
Melt the marshmallows and butter for the white center in the microwave in a microwave safe dish in 30 second increments. This will take about 1 minute.
Combine the third bowl of marshmallow with the Rice Krispies and mix.
Wet your hands and push the Rice Krispies into the hole in the center of the pan.
Let cool for about 1 hour and then serve!