Line an 8x8-inch baking pan with parchment paper. Set aside.
In a large pot set over low heat, melt the butter.
4 tablespoons unsalted butter
Add in the marshmallows and allow them to melt, stirring constantly, until they are smooth, about 2-3 minutes.
3½ cups mini marshmallows
Remove from heat and stir in the vanilla, cinnamon, and 4 cups of cereal.
1 teaspoon pure vanilla extract, ½ teaspoon ground cinnamon, 5 cups Cinnamon Toast Crunch cereal
Transfer the mixture to the prepared pan and spread it out to an even layer. Top with the remaining cup of cereal and press the bars down to pack them tightly--be careful, they’re hot!
Set them aside to cool to room temperature until set, about 1 hour.
Slice and serve.
Notes
*You can use marshmallow fluff instead of marshmallows, but the treats will be much stickier and less solid. They can be kind of a mess, but delicious nonetheless!Tips:
Be sure to use fresh marshmallows. Stale marshmallows will take too long to melt and will not melt smoothly.
If you melt your marshmallows too fast over too high of heat, it takes the marshmallows out of the hard-ball stage and into the hard-crack stage, where the marshmallows will become brittle and crack instead of stretching. Don't let the mixture go above 235°F.
Add 1 cup of cinnamon or white chocolate baking chips for even more flavor.
Microwave Instructions: You can melt the butter and marshmallows in the microwave in a large, microwave-safe bowl for 60 seconds. Stir, then heat for an additional 15-30 seconds until smooth. Continue with the recipe. Be sure to use the largest bowl you have, because the marshmallows expand a LOT in the microwave and can easily make a mess!
Storage: Store Cinnamon Toast Crunch bars in an airtight container at room temperature for up to 1 week, in the refrigerator for up to 2 weeks, or in the freezer for up to 3 months.