Layout plastic food wrap or parchment paper on a tray or large cutting board.
In a bowl, mix the ground turkey, ½ tbsp salt, cayenne pepper, cumin, black pepper, grated onion, breadcrumbs, ½ cup of parsley and ½ tbsp olive oil.
Break 1 tbsp size pieces from the mixture. Wet your hands and shape these pieces into round meatballs. Place meatballs side by side on the tray/cutting board.
Cut potatoes into two. Marinade with ½ tbsp salt and 1 tbsp olive oil.
For the potato salad sauce, mix remaining ½ cup parsley with dill, green onions, lemon juice and 2 tbsp olive oil in a large bowl. Set aside.
For the first basket, Press 1, select Air Fry, set the temperature to 400°F / 205°C and time to 23 Minutes.
For the second basket, Press 2, select Air Fry, set the temperature to 390°F / 200°C and time to 18 Minutes.
Select Sync Finish and Press Start. When the first basket is hot, add potatoes.
When the second basket is hot, place turkey meatballs to the bottom of the basket.
With the Turn Food signals, shake well both the potatoes and meatballs.
For the optional mushroom gravy sauté mushrooms with 1 tbsp of oil on medium to low heat in a hot pan. Add 1 tsp of salt.
When the mushrooms are cooked in about 5 Minutes, add chicken stock and let it thicken for a few minutes. When the potatoes are nicely browned, toss them with the sauce. Serve with the meatballs.
Top turkey meatballs with the mushroom gravy or serve with your favorite condiment.