Heat 1 tablespoon oil in a heavy bottom skillet, like cast iron.
Slice onions into quarter rings. Add to heated oil. Cook until softened, 5-10 minutes
Dice the potatoes. Precook in the air fryer (toss in 1 tablespoon of oil; 5-7 minutes at 400) or in the microwave (5 in minutes in a covered microwave safe dish) or on the stove top (boil in salted water until fork tender, 10-15 minutes).
Quarter and chunk zucchini.
Cut or tear deli corned beef into bite sized pieces.
Add potatoes, zucchini, and corned beef to the skillet. Add salt and pepper to taste. Cook until zucchini is done to your liking. We prefer it a little al dente.