The former Liberty Professionals winger executed his spot kick perfectly, but Jordan Harvey's rattled effort hit the crossbar as LAFC lost 5-4 on penalties.
LAFC were heading for a win before a 90th minute equalizer from Orlando City.
The California based club took the lead through veteran forward Bradley Wright-Philips, before Joao Moutinho's last minute header leveled the scoreline.
Blessing has been key to LAFC at the MLS is Back tourney, playing in all five games and scoring in the quarter final victory over Seattle Sounders.
The defeat means the petite Ghanaian winger will have to wait until next season to win his first major title with the club.
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