Line a 9×13 inch rectangular cake pan with parchment paper. Extend the parchment over both ends of the baking pan. Lightly spray the surface of the parchment that is inside the pan with nonstick spray to avoid the treats sticking after they set.
Using a large, deep pot or dutch oven, heat the butter over low heat. Using a silicone spatula, stir the butter until it is melted.
¼ cup unsalted butter
Stir in the pure vanilla extract and salt.
¼ teaspoon pure vanilla extract, ¼ teaspoon kosher salt
Pour in the marshmallows. Take your time to stir the mixture slowly until you see the mixture is completely melted.
25 ounces mini marshmallows
Remove the pot from heat. Begin to fold in the cereal right away. Ensure all of the cereal is completely coated with the marshmallow mixture.
10 cups Rice Krispies cereal
Transfer mixture to the prepared pan.
Using a silicone spatula, carefully distribute mixture equally across the pan.
Very gently press the mixture down into the pan so it is even across the top and remains secure in the pan. An easy way to press the treats into place is to spray a piece of parchment paper with cooking spray. Place the parchment over the treats and very gently press the treats with your hands.
Melt the white chocolate in a small microwavable bowl in the microwave using package instructions. Drizzle the melted goodness with a tablespoon over the entire pan of treats. See directions for melting almond bark on the package.
8 ounces white melting chocolate
Immediately sprinkle M&M's onto the warm drizzled white chocolate.
½ cup Easter M&M's
For best results, let the treats set for at least 30-60 minutes at room temperature. This will allow the chocolate to harden.
Before cutting, remove the rice krispie treats by using both sides of the parchment paper to lift the treats out of the pan and placing them onto a cutting surface. Cut into equal portions.