I have a gallon zip bag of sliced banana peppers brining in the fridge to be pickled and canned.
I brine with salt overnight. Then I rinse thoroughly in cold water. Next, I pack them in sterilized jars with pickling spice (I DIY it every time but try to incorporate mustard seed, celery seed, dill seed, a few peppercorns, oregano, parsley, crushed red pepper and 1 bay leaf per jar), fresh sliced onion (sometimes a few whole small onions if I need to fill up the last jar) and fresh garlic cloves. Then I fill the jars to 1/2 inch from the top with my go-to pickling liquid made of 1 part salt, 4 parts apple cider vinegar (5% acidity), 4 parts white vinegar (5% acidity), and 8 parts water -- typically that's 1 cup salt, 4 cups ACV, 4 cups white vinegar, and 8 cups water. I bring the pickling liquid to a boil and ladle it into the jars. Pop a sterilized lid on with a magnet wand, spin on a band to finger tightness, and process in a waterbath for 10-15 minutes (really takes 20-30 to let the water start boiling a bit again after the jars go in before starting to time it).
I tried pressure canning the banana peppers once, I found that they overcooked too easily in the pressure canner.