Step 1

Grease a 9 x 9 pan with cooking spray and set aside.

Step 2

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

Step 3

Add the marshmallows and salt and stir with a rubber spatula, scraping down the sides to make sure the marshmallows do not burn. As soon as the marshmallows are melted, remove from the heat immediately.

Step 4

Add the Lucky Charms cereal, folding to coat the cereal completely.

Step 5

Spoon the mixture into the prepared pan, pressing down into an even layer.*

Step 6

Place in the fridge to set for at least 20 minutes. Once set, use a sharp knife to cut the Rice Krispie treats into 12 rectangles.