Also going by memory (since I did not write it down), but this is what I used for the marinade (it makes a lot of marinade though so it could probably work for a couple pounds of steak easily):
1 Tablespoon vegetable oil
2 Tablespoons cup lemon juice (Or you can split it with 1 Tablespoon of Lemon Juice and 1 Tablespoon of Apple Cider vinegar)
2 Tablespoons soy sauce (I would probably use a bit less next time, like 3 tbsp)
1 teaspoon Dijon mustard
2 Tablespoons Worcestershire sauce
1 teaspoon minced garlic
1 to 1½ pounds of Sirloin Steak (cubed)
1 tablespoon Badia Andrew Zimmern Mediterranean Magic All-Purpose Seasoning
Then I marinated the steak for a day in the fridge.
The veggies were one of each of these, chopped into kabob size chunks (if you are using bamboo skewers, you may want to start soaking them in water while you prep the veggies). I used the tops and bottom trimmings from the peppers to make a Cucumber Salad:
1 Red Onion
1 Green Bell Pepper
1 Red Bell Pepper
If you are trying to avoid gluten, then I would seer clear of adding mushrooms, since they are often grown in a bed of gluten containing grains. There are some which are labeled "Gluten Free" but usually those are smaller, canned mushrooms. Squash, pineapple and cherry tomatoes would be good with this though.
Next just put everything on skewers, drizzle the remaining marinade over the veggies, and stick 'em in the air fryer at 400°F (I think I'd use 375°F next time) for about 10 minutes, or until they are 140°F inside (thats the same as a medium steak). You can of course add a couple more minutes if you prefer them well done (I ran them for 12 minutes and they were well done).
Add some Tzatziki Sauce, Cucumber Salad, Greek Lemon Rice, (I add a couple light shakes of the Mediterranean Magic to the rice), and Opa! you got dinner.