The best doughnuts in Las Vegas. I lived in Sin City for 2 months while dieting (ha! true and it worked!) and my cheat days were spent testing donuts. I've tried Pinkbox, Donut Tyme, and all the others, and Master Donuts is hands down the best.
They aren't open 24/7 but open at 3am so if you are up late don't miss out. Otherwise get there early when Kenny is still serving so you'll get the freshest batch. Quick tip: If you can't get there early you can call in and have him put some aside for you before the good stuff sells out.
PinkBox gets a lot of press and their donuts are pretty, but that's it. The taste is bland and the same low-grade whipped cream fills everything. Similarly for Donut Tyme and others in town, you can taste that they don't use real sugar and real butter. Master Donuts is where it's at!!!