does anyone remember the name of that 90s live-action weekday afternoon show starring Matthew Lawrence (i think it was matt, it was definitely one of the Lawrence brothers) that, for some reason, even though it had nothing to do with Nintendo as far as i remember, would consistently play background music and sound effects from the Super Mario Bros. Super Show?

was it "Superhuman Samurai Syber-Squad" or am i thinking of something else?

It sounds like you are describing Superhuman Samurai Syber-Squad.