Wash all the peppers.
Slice in half, removing the seeds and any mushy parts.
If using slices or diced (any type of smaller pieces), put them in a single layer on a baking tray and stick in the freezer until frozen. (You can skip this step with halves)
Toss pre-frozen peppers in a bag (4 - 5 peppers will fit into a gallon-sized bag) and into the freezer.