Slice tops off all peppers, then slice peppers into thin discs. Put peppers into a 6 quart jar.
Mix canola oil, vinegar, water, salt, oregano, garlic, and sugar together in a large bowl until salt and sugar are dissolved. Pour over peppers in the jar; stir and refrigerator for 24 hours.
Stir peppers before serving; store remaining pickled peppers in the refrigerator.
Pickled Banana Peppers · Dinner Match Lab | Dinner Match Lab