Set the oven temperature to 220ºF, with the oven rack in the middle position.
Line the baking sheet with parchment paper or aluminum foil, and lightly break up or grind the cannabis onto it.
Heat for 30-40 minutes, stirring at least once.
Let cool for 30 minutes at room temperature.
When cool enough to handle, add the decarboxylated cannabis to butter, oil, or another base for an infusion, or carefully put it in a storage container for future use.
