Hi J.:
You can used the dried chilies in any kind of stew or soup to which you want to add a little kick of heat. Drop them in whole and fish them out before serving.
I often use them in a stir fry. You could drop them into the oil to flavor the oil before cooking the meat or veggies. You can add them at the end to only the servings who like spice. I take out servings for children and my mom first, add the chilies at the end for myself.
Using other types of dried chilies:
For tortilla soup or pazole, dried chilies are rehydrated in the soup broth, when the chilies soft they are removed put into a blender with enough broth to cover the chilies and then blended into a semi-smooth paste and returned to the soup. This makes the soup a rich red color and gives it plenty of heat! Be careful when working with chilies it will stain any cloth it comes into contact with!