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.