If it was me, I'd go Las Vegas (you don't have to stop :-)) to Reno, then 395 north to Susanville. From there California 44 to just north of Lassen NP where it becomes Calif. 89, which joins I-5 just south of Mt Shasta.
Once you get north of Tonopah, it's not flat, boring desert. Nice scenic views of snow-capped mountains, then from Susanville you're driving through pine forest.
If you do take this route, get gas in Carson City, not Reno: it's 20 cents or so cheaper.
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