I convert mine to soup and add whatever veggies I have.
Yesterday we had tacos, beans and rice. Today we are going to have TACO SOUP. Combine the leftovers, add beef broth and add some veggies. Adjust the seasonings and VOILA!
When we have leftover chicken and noddles or mashed potatoes and veggies guess what happens to them? Just add chicken broth, whatever veggies you have on hand to the leftovers and adjust the seasonings.
Leftover salmon or other fish? FISH CHOWDER of course. What else? Are you a fan of soup? From the Campbell's or Progresso soup can can or from whatever you have on hand?