Amanda Bynes has been charged with TWO counts of hit-and-run -- after allegedly smashing into some car and fleeing the scene ... twice.
If convicted on both counts, she faces up to a year in jail.
We broke the story ... prosecutors recently reopened Bynes' hit-and-run case from back in April because the actress was accused of yet another hit-and-run last month.
Now, the L.A. City Attorney has taken the next step -- charging Bynes with two counts of misdemeanor hit-and-run, stemming from the two incidents.
As for the second alleged incident, we're told the "smoking gun" for detectives was that the damage to the victim's car matched the damage to Amanda's.
She's due in court September 27th.
Calls to Bynes' reps weren't immediately returned.