In a bowl, combine the ground turkey, sea salt, black pepper, and garlic powder, then roll into 1-inch meatballs.
Heat the olive oil in a large skillet over medium heat and sear the meatballs until browned and cooked through, about 8-10 minutes.
Remove meatballs from the pan and add the sliced mushrooms and diced onions, sautéing until they are tender and golden brown.
Add the minced garlic to the skillet for 30 seconds, then pour in the beef broth and Dijon mustard, scraping up any browned bits.
Turn the heat to low and whisk in the Greek yogurt until the sauce is creamy and smooth, then return the meatballs to the skillet.
Briefly sauté the zucchini noodles in a separate pan until just tender, then plate and top with the meatball stroganoff and fresh parsley.