I recently learned that I am allergic to ALL forms of pepper except black pepper. Bell peppers, chili peppers, etc. I am allergic to and it makes my throat swell up. I have several recipes using ground chili pepper. Is there a substitute spice that will give my (mostly ground beef casseroles) recipes SOME flavor?
You are not going to find anything outside the chili family that gives quite the same flavor, so substituting flavor-wise is not going to be possible. Note that paprika is a spice ground from particular pepper, so if you are allergic to all capsicum peppers, you don't want to use it.
What you can do is build other flavorful combinations which you enjoy and which you can eat. Some things to consider that bring a touch of some type of heat with them include:
All of these flavors are "hot" but from different chemicals than the capsicum peppers, so they will all have different effects.