First, make 3 batches of Rice Krispie treats: white, blue, and red.
Add the Rice Krispie cereal and mix until the cereal is completely coated with the melted marshmallows. Set aside.
Repeat the same process for the red layer. Melt the next two tablespoons of the butter in a medium pan on medium-low heat. Add mini marshmallows, stir until they are completely melted. Turn off the heat. This time, add in 5 dots of red food coloring.
Repeat the same process for the blue layer, but add in 5 dots of blue food coloring.
Press the Rice Krispie treat mixture onto two cookie sheets in a thin layer of equal thickness. Let set for approximately 15 to 30 minutes.
Cut the two sheets of Rice Krispie treats into three equal pieces. Each of these will be a "stripe" in the flag.
Stack 2 white and 2 red strips of Rice Krispie mixture, alternating colors, starting with a red layer.
Cut the remaining red and white Rice Krispie Treat sheets in half again. Layer three of these "half" pieces (red/white/red) to make the stripes that appear to the right of the blue area of the flag, leaving a place for the blue on the left. Place this stack on top of the other stack on the right-hand side.
Butter your fingers and mold the blue Rice Krispie mixture into a rectangle that fits into the red and white stacked flag layers. Press into the layers. Let set 5 minutes.
Once the Rice Krispie Treat mixture is completely cool, use a hot butcher knife to cut through the stacked layers, creating a flag pattern.
Trim off a little bit on the left and right edges, and enjoy!