In a paper packet, add 300 grams of your favorite brand of cornstarch.
Shake and tap the packet to remove any air pockets.
Seal the paper packet tightly by wrapping it with aluminum foil.
Preheat your oven to 375°F (190°C).
Place the wrapped packet in a baking dish and bake for 2 hours.
Let it cool down to room temperature and then freeze for 4 hours.
Unwrap the foil and remove the cornstarch chunk from the paper packet.
Break it into bite-sized chunks.
Enjoy your homemade crunchy cornstarch! Adjust cooking time as needed based on your oven.