Line a baking pan with parchment paper and set it aside.

In a large pot over low heat, melt the butter.

Set aside 1 ½ cups of mini marshmallows to mix in later. Add the remaining marshmallows into the pot with the melted butter and stir slowly until fully melted and incorporated.

Remove the pot from the heat and mix in the vanilla extract and salt.

Fold in the Rice Krispies cereal, M&M’s, sprinkles, and the 1 ½ cups of mini marshmallows that were set aside earlier. Fold together until evenly distributed and coated. Move quickly so that the chocolate doesn't melt.

Spread the Rice Krispies mix into an even layer in the baking pan and lightly press it in. Do not overly pack it in or it will result in tough to eat treats.

Melt the red, white, and blue candy melts in separate piping bags or bowls. Use a low or defrost microwave setting in 30 second increments to avoid it from overheating and melting the bag.

Snip a small piece of the tip of the piping bag and drizzle over the rice krispie treats. Top with additional M&M’s and sprinkles if desired.

Allow it to cool on the counter for 30 minutes to 1 hour before cutting into squares. Enjoy!