IKEA ikea ikea...
Do you want to make one or buy one?
You could measure the fronts of your drawers/doors of your current vanity and have a glass company cut mirrors to fit nicely on the fronts. Easy peasy! They'll be able to tell you how to adhere them so you don't ruin the mirror finish. Or build what you want and have the mirrors cut to fit the sides (if you do shelving).
for this best to use a construction adhesive comes in tube like caulk, don't forget to have them drill holes for knobs if putting them on drawer or cupboards fronts
Here are some ideas https://www.hometalk.com/32884499/20-diy-vanity-projects-you-can-do-right-now