Premeasure all ingredients before you begin cooking and line a 9x13-inch baking sheet with parchment paper and coat with non-stick spray; set aside.
In a large saucepan, melt the butter, salt, and 8 cups of marshmallows together until smooth.
½ cup salted butter, 10 cups mini marshmallows
Remove from heat and stir in the vanilla. Followed but the remaining 2 cups of marshmallows and the cereals until fully coated.
1 teaspoon vanilla extract, 5 cups Rice Krispies, 2 cups Rice Chex, 2 cups Frosted Cheerios
Gently and quickly fold in the M&Ms and sprinkles then transfer the mixture to the prepared baking dish.
1 cup Easter M&Ms
Top with extra M&M’s and sprinkles, if desired, and use parchment paper or greased hands to gently press the mixture into the pan.
2 teaspoons Easter sprinkles
Allow to set for 30 minutes before removing from the pan and cutting into squares.