Have a team meeting. Tell everyone what they did, how their efforts and contributions helped deliver the MVP, and give them a spot bonus. The spot bonus doesn't have to be large, I would say 100 to 500 dollars. The recognition and the bonus will boost their morale and make them happier employees.
For that size of bonus, it's nice to work out the net amount after tax, and hand the employee cash. e.g. if you want to give a 500USD spot bonus, then gross it up to 800 or whatever pre-tax, and hand them 500USD cash in an envelope.
