Add the marshmallows and butter into a large microwave-safe bowl and microwave for 45 seconds. Stir the mixture well and microwave another 15-20 seconds. Stir until the mixture is smooth and well incorporated.
Microwave the marshmallows and butter in the microwave for 30 seconds, stir, and then heat for another 15-20 seconds. Add the vanilla and food coloring and mix. Stir in the cereal until everything is well coated.
Microwave the marshmallows and butter for 30 seconds, stir well, and then heat again for 15-20 seconds. Stir in the cereal until well coated. Fill the hole in the middle of the cake pan with the white Rice Krispies mix.
Allow the candy corn treats to set for 30 minutes at room temperature before removing them from the pan and cutting into 8 slices – cut it like you would a pie so you end with the triangle shaped candy corn pieces of treat.