Think about a time you helped improve a process.
Think about a time you coached (help,guide , teach) a TM.
Think about a time you went above and beyond for a guest.
Think about what some Improvements you think can be made to sbux as it stand now.
The interview will revolve around these situations above.
You should be able to give specific instances, and then speak about your approaches.
Be confident, make eye contact and ask questions. Go in there like a boss, and come out an actual boss.