After returning from a year in Korea, we just HAD to get a rice cooker. The Koreans couldn't live without it and now neither can I! If you don't have one, well...I recommend one. But you certainly can make this meal in a slow-cooker or even in a pot on the stove - but you'll need to watch the pot and stir:) It starts to smell wonderful after about 20 minutes.
I've created about a kazillion rice-cooker dishes, but this one is one of my favorites. I'll be honest, I don't measure my ingredients, so these are approximations. I get Mexican seasoning "homemade" from my local health-food store. If that's not option, make your own or buy one you're comfortable with.