I have made this with a variety of different meats. Cooked chicken, turkey, and pork roast are all great, this is one of my stand-bys for leftover protein. If I don't have any leftover cooked meat in the freezer then I make it the following way with ground chicken, pork or turkey. I actually created this for use with leftover Thanksgiving turkey. If making with cooked meat, just skip browning the meat, and just cook the onion and pepper with the spices, then add the cooked meat with the remaining ingredients. Measurements are slightly approximated, and if you want it spicy then add a chopped serrano or jalapeno to the mix. If not using a nonstick pan you made need to add a bit of extra oil or water to the meat when browning so it doesn't stick.