Wash and dry the peppers. Remove the stems and seeds.
Cut the peppers into desired size and shape, such as diced or strips. You can also leave them whole.
Spread the peppers out on a baking sheet.
Place the baking sheet in the freezer, somewhere it won't get bumped. Let the peppers freeze for about an hour or until they are solid.
Transfer the frozen peppers to freezer bags or containers. Seal tightly, label, and store in the freezer.
Use within six months and preferably three months. Add frozen peppers directly to hot dishes like soups, stir fries, and casseroles. Do not thaw them first or use them in dishes that call for raw peppers or else they will get mushy.
Notes
4 medium bell peppers yield about 2 cups diced
These instructions also apply to freezing other types of peppers, not just bell peppers!