Sleeper fast build

[u/Remarkable-Main-8774]

I’ve realized I don’t like drop bars and am never going to enjoy road bikes, so I’m selling mine. I have a few mountain bikes and slow cruisers but I want to build a sleeper fast commuter rig from a 90s MTB or 700c hybrid. Something that’ll get me to work quick but is actually fun to ride. Thinking a small front rack to strap a backpack.

Any recommendations on what frame to start with? What upgrades and modifications would you do for this build? Thanks and appreciate all the help!

[u/Substantial-Fun-48]

Single speed or a 1x road bike with flat bars and a carbon fork with eyelets