I do
All I do is take a shoe box sized tuperwear container, fill in with oat meal, then put a bunch of mealworms in there. every once in a while add some sliced potato, and other fruits and veggies. After a while they will turn to beetles and mate, then they will die. After a few weeks you will see tons of tiny worms in the oat meal, its realy easy, the only problem is that they grow so slow.