Mitchell's three-year collegiate career ended with a ring, as he and the Baylor Bears were crowned 2021 NCAA National Champions. His career began at Auburn, though, where Mitchell appeared primarily as a reserve, logging 17.1 mpg in 34 contests. He proceeded to transfer and sit a season before catching on with Baylor, where he earned a starting spot immediately. Mitchell's junior year saw him average 9.9 points and 3.8 assists en route to third-team All-Big 12 honors. He ramped up his production in a major way the following season, making the first-team All-Big 12 behind averages of 14.0 ppg, 5.5. apg and 2.7 rpg. His efficiency couldn't be matched within the conference, as he led the Big 12 in true shooting percentage and effective field-goal percentage. Most impressive were his defensive contributions, however, as Mitchell was named to the conference all-defensive team for the second consecutive season, as well as named 2020-21 Big 12 Defensive Player of the Year.