Decarboxylate Cannabis: Preheat oven to 240°F (115°C). Spread ground cannabis on a baking sheet lined with parchment paper. Bake for 30–40 minutes, stirring occasionally. Let cool.
Preheat Oven: Increase oven temperature to 325°F (163°C).
Prepare Crackers: Spread peanut butter evenly over one side of each cracker.
Add Cannabis: Sprinkle the decarboxylated cannabis evenly over peanut butter on one cracker. Add optional toppings if desired.
Assemble Firecracker: Place the second cracker on top to make a sandwich, peanut butter side down.
Wrap and Bake: Wrap tightly in aluminum foil. Place on a baking sheet and bake for 20–25 minutes.
Cool: Remove from oven and allow to cool completely before unwrapping and eating.