In a large microwave-safe bowl, melt the butter and marshmallows together in the microwave for about 2 minutes, stirring halfway through until smooth.

Add the Rice Krispies cereal to the melted mixture and stir until well combined.

Press the mixture into a greased 9x13 inch baking dish evenly.

Drizzle the melted white chocolate over the top of the Rice Krispie treats.

Sprinkle red and blue sprinkles evenly over the chocolate to create a festive look.

Let the treats cool completely before cutting into squares.