Steep the chai tea bags in ½ cup boiling water for 10 minutes, or until very potent. Discard the tea bags and measure out 1/3 cup of tea. Allow it to cool to room temperature.
Pour the cooled tea into the bowl of an electric mixer. Sprinkle the powdered gelatin on top.
Let sit for 5 minutes.
Place the sugar and ¼ cup cold water in a small pot and set to medium-high heat. Stir until the sugar has melted.
Attach a candy thermometer to the pot and boil the sugar until it reaches 238F. Brush the sides of the pot with a wet pastry brush if sugar crystals stick to the sides. Remove the pot from the heat and stir until the sugar stops boiling.
Add the hot sugar to the gelatin and stir the mixture by hand whisking for a few minutes to slightly cool. Then beat with an electric mixer on medium-high speed for 8-10 minutes, until soft peaks form. Add the vanilla bean seeds or extract and cinnamon and mix until combined.
Spoon the marshmallow mixture into a piping bag and snip a medium-sized hole at the tip.
Pipe cloud shapes onto a baking sheet lined with a silpat mat or a sheet of parchment paper. Allow the marshmallows to sit at room temperature overnight, or until set.
In a small bowl, combine the corn starch, confectioner’s sugar and cinnamon. Place it in a mesh sieve and dust it over the marshmallows.
Use a butter knife or spatula to gently lift the marshmallows off the silpat mat (or parchment paper) and flip them over. Dust the undersides with the cornstarch mixture.
Place the marshmallows in an empty mesh sieve and bounce them around a couple times to remove any excess powder.
Place them in your hot chocolate and enjoy!