Wikipedia covers it:

The trademark dates to 1893, although Aunt Jemima pancake mix debuted in 1889. The Quaker Oats Company first registered the Aunt Jemima trademark in April 1937.  Aunt Jemima originally came from a minstrel show as one of their pantheon of stereotypical Black characters. The character appears to have been a Reconstruction eraaddition to that cast.

Given its history, some consider the character to be an offensive embodiment of racist stereotypes and attitudes, while others see the brand with nostalgia and object to criticism as political correctness.

We'll leave that for another day. (Which will not come.) Aunt Jemima doesn't appear in these ads, except as she's shown here - a human who doesn't interact with the busy cartoon family.

"You're on the beam, kids, when you eat Muffets for breakfast." As in Little Miss, sitting on her Tuffet.

Where's your tuffet? Do you even have a tuffet? You even know where the beam is?