From the Super Mario Wiki
Fiery Drumsticks are items that are only consumable by Bowser in Mario & Luigi: Bowser's Inside Story. They are stronger than the Hot Drumsticks, but weaker than the TNT Drumsticks. If used, Bowser immediately heals 150 HP. It can be bought from Broque Monsieur's item shop after the boss fight against Bowser's Castle for thirty coins. Several enemies also have a chance of dropping one after fighting them: among them, Midbus has a 100% chance during his second boss battle, and Naplocks have a 5% chance.
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