Decadent, gooey cereal bars made with Cinnamon Toast Crunch cereal, chocolate M&M candies and mini marshmallows! Dare I say they're even better than S'mores?
Butter a 9x13-inch baking dish or line with parchment paper; set aside.
Grease the inside of a large mixing bowl with butter, then pour in the cereal, one cup of mini marshmallows, and half of the mini M&M's.
Melt the butter in a large saucepan on low heat.
Add the bag of marshmallows. Stir, melting the marshmallows, until they have dissolved into a smooth mixture. Remove from the heat and stir in the vanilla extract.
Pour the marshmallow mixture over the cereal and gently stir to coat evenly.
Turn out the cereal mixture into the prepared pan. Sprinkle the remaining M&M's on top. Butter your hands, then firmly press the mixture into an even layer. Cover with plastic wrap and let sit until it sets, about an hour.
Slice into squares and serve.
Store in a closed container for up to 5 days at room temperature.