My interview was with a member of the Executive MBA admissions team (even though I interviewed for full time).
Incredibly relaxed interview that consisted of me talking for about 30ish minutes with interjections when adcom had clarifying questions. I was able to lead the conversation however I wanted and had some great informal tangents that made it fun. My advice would be to have a plan for the key points you want to hit as you are generally in control.
We discussed my undergrad, professional experience, why MBA, why Darden, and short term goals. We also touched on personal interests.