My mother cuts them in half, cores them, puts them in a ziplock bag and tosses them in the freezer. As simple as that. We grow our own peppers and have them all year long with the freezing process. When you thaw them out they can be a bit soft but the still have their flavor.
You can also make stuffed peppers and freeze them pretty much the same way. Just cook you "stuffing", and after cutting and coring the pepper, stuff the fresh pepper and put the different halves in a box or some other container to keep them up right while they freeze. When you want stuffed peppers for dinner, bring them out, let them thaw and bake them.
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