Line a 9x13-inch baking dish with aluminum foil and lightly coat with nonstick spray, leaving overhang on two sides.
In a large pot, melt the butter over medium-low heat.
Add the marshmallows and stir frequently until completely melted and smooth.
Stir in the vanilla extract.
Add the Rice Krispies and Cinnamon Toast Crunch, folding gently until everything is evenly coated.
Transfer the mixture to the prepared baking dish and press into an even layer. If it's sticky, let it cool slightly and coat your hands with a bit of oil before pressing.
Let the treats set at room temperature for about 30 minutes.
Transfer to a cutting board. Melt the white chocolate in a microwave-safe bowl in 20-second bursts, stirring between each, then stir in the ground cinnamon.
Drizzle the cinnamon chocolate over the treats and sprinkle with extra crushed Cinnamon Toast Crunch.
Slice into 12 bars, serve, and enjoy.