Emmy's Enchiladas (Connecticut-Mex?)

I'd substitute Monterrrey Jack or Pepper Jack for the Colby, probably cut the total amount of cheese and add more onion. I might leave the red bell pepper out and sprinkle it raw on top after cooking with the other garnishes. I personally would never add green bell pepper before cooking. It overpowers everything else. But if you like that... Mild Hatch chilies would be fine, though if heat is a problem for you, it's easy to get a really hot Hatch chili among the mild ones. (The canned green chilies I use are usually mild. But the last batch I opened was really hot.) Emmy's using Old EL Paso enchilada sauce which is fine for this kind of quick and simple recipe.