These enchiladas are really easy.
2-3 pieces of chicken, cubed and cooked
2 cans cream of something (generally cream of chicken, or 1 can cream of chicken, 1 can cream of mushroom)
1 can enchilada sauce
1 sm. can green chilies (diced)
Mix the chicken, cream of somethings, chilies, half the enchilada sauce, some sour cream and some cheese in a bowl. This is your filling for the tortillas. Fill up the tortillas and place in a baking dish. Top with green onions, sour cream dollops, and cheese. Bake at 350F for 30-40 minutes (until cheese is melted and everything looks done).
You can also do this in a crock pot so that the chicken is cooked when you get home. Just throw everything into the crock pot with the frozen chicken. 40 minutes before dinner, shred the chicken and fill the tortillas. Top and bake as instructed above.