Ariel Robinson — a former winner of ‘Worst Cooks in America’ — jokingly discussed raising kids in a brutal manner before she was charged with killing one of her own … and we’ve got the video.

We’ve obtained footage of Ariel performing an impromptu stand-up routine in Spartanburg, SC in 2019, in which she’s discussing trying to adopt a daughter … and a social worker coming to her home to make sure she was a fit parent.

As Ariel recounts the story, she talks about two other children of hers — an 8-year-old boy and an 11-year-old boy, both of whom wanted a little sister — and how they were acting wild while the worker was there. She says she should’ve…