• Line a 9x13-inch pan with parchment paper or lightly grease it with butter or non-stick spray.

Make Yellow Layer:

• In a large saucepan, melt 1 tablespoon of butter over low heat.
• Add 1⅓ cups mini marshmallows and stir until fully melted and smooth.
• Add a few drops of yellow food coloring and mix until evenly tinted.
• Stir in 2 cups of Rice Krispies cereal until fully coated.
• Press the mixture evenly into the prepared pan using a spatula.

Make Orange Layer:

• In the same pan, melt another 1 tablespoon of butter over low heat.
• Add 1⅓ cups mini marshmallows and stir until melted.
• Mix in a few drops of orange food coloring.
• Stir in 2 cups of Rice Krispies cereal and mix until combined.
• Gently press this layer on top of the yellow layer.

Make White Layer:

• Melt the final tablespoon of butter and remaining 1⅓ cups marshmallows.
• Skip the food coloring.
• Stir in the last 2 cups of Rice Krispies cereal.
• Press the white layer evenly over the orange layer.

Cool and Decorate:

• Let the layered Rice Krispie treat cool at room temperature for at least 1 hour.
• Optionally, melt white chocolate chips and drizzle over the top.
• Press candy corn pieces gently into the surface once cooled.

Slice and Serve:

• Remove from the pan and slice into triangles or squares.
• Serve and enjoy!