Bring a large pot of salted water to a boil and cook the pappardelle according to package instructions until al dente.
While the pasta cooks, heat the olive oil in a large skillet over medium-high heat.
Add the ground beef to the skillet, breaking it apart with a wooden spoon, and cook until browned through.
Stir in the finely diced onion, carrot, and celery, cooking for 5 minutes until the vegetables are tender.
Add the minced garlic, sea salt, black pepper, and dried oregano, then sauté for 1 minute until fragrant.
Pour in the tomato puree and simmer on low heat for 5-7 minutes to allow the flavors to meld.
Reserve 2 tablespoons of the pasta water, then drain the noodles.
Remove the skillet from the heat and stir in the Greek yogurt and reserved pasta water to create a creamy sauce.
Toss the cooked pappardelle into the sauce until well coated and garnish with chopped fresh parsley.