I often think the bias occurs before the interview in terms of the pipeline. For me, that's my largest self-correcting area. There are groups of people or people who present themselves in a certain way that I simply don't want to interview because it feels like 'wasting my time'. Clearly that's bullshit and I make an active effort to overcome those biases and, if anything, now am overcorrecting (a better mistake to make imo). Once they're in the room, you're outline seems like a solid way to measure they're abilities.

Of course I'm not saying there isn't opportunity for bias here as well (mainly in the selection of the question), but you've offset it magnificently by having written down the correct answer and (hopefully) prioritizing getting said answer rather than the manner in which it was conveyed ("I think..", questions rather than statements ("It's x, right?"), "Maybe it's..", etc. since those types of self-effacing comments are often seen and presented as polite forms of communicating for women).