Burger King Black Face

Burger King is under fire after an employee wore blatant blackface while working the drive-thru on Halloween ... and now the fast food chain is speaking out.

A viral video shows the Burger King worker -- a white woman -- wearing dark makeup painted all over her face ... and she doesn't seem to understand that what she's doing is offensive.

A customer calls her out, but she shockingly defends her Halloween costume ... claiming blackface isn't bad "as long as you have a good heart."